Feature/global proxy (#596)

* refactor(proxy): simplify logging for better readability

- Delete 17 verbose debug logs from handlers, streaming, and response_processor
- Convert excessive INFO logs to DEBUG level for internal processing details
- Add 2 critical INFO logs in forwarder.rs for failover scenarios:
  - Log when switching to next provider after failure
  - Log when all providers have been exhausted
- Fix clippy uninlined_format_args warning

This reduces log noise while maintaining visibility into key user-facing decisions.

* fix: replace unsafe unwrap() calls with proper error handling

- database/dao/mcp.rs: Use map_err for serde_json serialization
- database/dao/providers.rs: Use map_err for settings_config and meta serialization
- commands/misc.rs: Use expect() for compile-time regex pattern
- services/prompt.rs: Use unwrap_or_default() for SystemTime
- deeplink/provider.rs: Replace unwrap() with is_none_or pattern for Option checks

Reduces potential panic points from 26 to 1 (static regex init, safe).

* refactor(proxy): simplify verbose logging output

- Remove response JSON full output logging in response_processor
- Remove per-request INFO logs in provider_router (failover status, provider selection)
- Change model mapping log from INFO to DEBUG
- Change usage logging failure from INFO to WARN
- Remove redundant debug logs for circuit breaker operations

Reduces log noise significantly while preserving important warnings and errors.

* feat(proxy): add structured log codes for i18n support

Add error code system to proxy module logs for multi-language support:

- CB-001~006: Circuit breaker state transitions and triggers
- SRV-001~004: Proxy server lifecycle events
- FWD-001~002: Request forwarding and failover
- FO-001~005: Failover switch operations
- USG-001~002: Usage logging errors

Log format: [CODE] Chinese message
Frontend/log tools can map codes to any language.

New file: src/proxy/log_codes.rs - centralized code definitions

* chore: bump version to 3.9.1

* style: format code with prettier and rustfmt

* fix(ui): allow number inputs to be fully cleared before saving

- Convert numeric state to string type for controlled inputs
- Use isNaN() check instead of || fallback to allow 0 values
- Apply fix to ProxyPanel, CircuitBreakerConfigPanel,
  AutoFailoverConfigPanel, and ModelTestConfigPanel

* feat(pricing): support @ separator in model name matching

- Refactor model name cleaning into chained method calls
- Add @ to - replacement (e.g., gpt-5.2-codex@low → gpt-5.2-codex-low)
- Add test case for @ separator matching

* feat(proxy): add global proxy settings support

Add ability to configure a global HTTP/HTTPS proxy for all outbound
requests including provider API calls, speed tests, and stream checks.

* fix(proxy): improve validation and error handling in proxy config panels

- Add StopTimeout/StopFailed error types for proper stop() error reporting
- Replace silent clamp with validation-and-block in config panels
- Add listenAddress format validation in ProxyPanel
- Use log_codes constants instead of hardcoded strings
- Use once_cell::Lazy for regex precompilation

* fix(proxy): harden error handling and input validation

- Handle RwLock poisoning in settings.rs with unwrap_or_else
- Add fallback for dirs::home_dir() in config modules
- Normalize localhost to 127.0.0.1 in ProxyPanel
- Format IPv6 addresses with brackets for valid URLs
- Strict port validation with pure digit regex
- Treat NaN as validation failure in config panels
- Log warning on cost_multiplier parse failure
- Align timeoutSeconds range to [0, 300] across all panels

* feat(proxy): add local proxy auto-scan and fix hot-reload

- Add scan_local_proxies command to detect common proxy ports
- Fix SkillService not using updated proxy after hot-reload
- Move global proxy settings to advanced tab
- Add error handling for scan failures

* fix(proxy): allow localhost input in proxy address field

* fix(proxy): restore request timeout and fix proxy hot-reload issues

- Add URL scheme validation in build_client (http/https/socks5/socks5h)
- Restore per-request timeout for speedtest, stream_check, usage_script, forwarder
- Fix set_global_proxy_url to validate before persisting to DB
- Mask proxy credentials in all log outputs
- Fix forwarder hot-reload by fetching client on each request

* style: format code with prettier

* fix(proxy): improve global proxy stability and error handling

- Fix RwLock silent failures with explicit error propagation
- Handle init() duplicate calls gracefully with warning log
- Align fallback client config with build_client settings
- Make scan_local_proxies async to avoid UI blocking
- Add mixed mode support for Clash 7890 port (http+socks5)
- Use multiple test targets for better proxy connectivity test
- Clear invalid proxy config on init failure
- Restore timeout constraints in usage_script
- Fix mask_url output for URLs without port
- Add structured error codes [GP-001 to GP-009]

* feat(proxy): add username/password authentication support

- Add separate username and password input fields
- Implement password visibility toggle with eye icon
- Add clear button to reset all proxy fields
- Auto-extract auth info from saved URL and merge on save
- Update i18n translations (zh/en/ja)

* fix(proxy): fix double encoding issue in proxy auth and add debug logs

- Remove encodeURIComponent in mergeAuth() since URL object's
  username/password setters already do percent-encoding automatically
- Add GP-010 debug log for database read operations
- Add GP-011 debug log to track incoming URL info (length, has_auth)
- Fix username.trim() in fallback branch for consistent behavior

src-tauri/src/services/skill.rs

@@ -7,7 +7,6 @@
 
 use anyhow::{anyhow, Context, Result};
 use chrono::{DateTime, Utc};
-use reqwest::Client;
 use serde::{Deserialize, Serialize};
 use std::collections::{HashMap, HashSet};
 use std::fs;
@@ -143,9 +142,7 @@ pub struct SkillMetadata {
 
 // ========== SkillService ==========
 
-pub struct SkillService {
-    http_client: Client,
-}
+pub struct SkillService;
 
 impl Default for SkillService {
     fn default() -> Self {
@@ -155,13 +152,7 @@ impl Default for SkillService {
 
 impl SkillService {
     pub fn new() -> Self {
-        Self {
-            http_client: Client::builder()
-                .user_agent("cc-switch")
-                .timeout(std::time::Duration::from_secs(10))
-                .build()
-                .unwrap_or_else(|_| Client::new()),
-        }
+        Self
     }
 
     // ========== 路径管理 ==========
@@ -863,7 +854,8 @@ impl SkillService {
 
     /// 下载并解压 ZIP
     async fn download_and_extract(&self, url: &str, dest: &Path) -> Result<()> {
-        let response = self.http_client.get(url).send().await?;
+        let client = crate::proxy::http_client::get();
+        let response = client.get(url).send().await?;
         if !response.status().is_success() {
             let status = response.status().as_u16().to_string();
             return Err(anyhow::anyhow!(format_skill_error(

src-tauri/src/services/speedtest.rs

@@ -1,7 +1,7 @@
 use futures::future::join_all;
 use reqwest::{Client, Url};
 use serde::Serialize;
-use std::time::{Duration, Instant};
+use std::time::Instant;
 
 use crate::error::AppError;
 
@@ -65,17 +65,21 @@ impl SpeedtestService {
         }
 
         let timeout = Self::sanitize_timeout(timeout_secs);
-        let client = Self::build_client(timeout)?;
+        let (client, request_timeout) = Self::build_client(timeout)?;
 
         let tasks = valid_targets.into_iter().map(|(idx, trimmed, parsed_url)| {
             let client = client.clone();
             async move {
                 // 先进行一次热身请求，忽略结果，仅用于复用连接/绕过首包惩罚。
-                let _ = client.get(parsed_url.clone()).send().await;
+                let _ = client
+                    .get(parsed_url.clone())
+                    .timeout(request_timeout)
+                    .send()
+                    .await;
 
                 // 第二次请求开始计时，并将其作为结果返回。
                 let start = Instant::now();
-                let latency = match client.get(parsed_url).send().await {
+                let latency = match client.get(parsed_url).timeout(request_timeout).send().await {
                     Ok(resp) => EndpointLatency {
                         url: trimmed,
                         latency: Some(start.elapsed().as_millis()),
@@ -112,19 +116,11 @@ impl SpeedtestService {
         Ok(results.into_iter().flatten().collect::<Vec<_>>())
     }
 
-    fn build_client(timeout_secs: u64) -> Result<Client, AppError> {
-        Client::builder()
-            .timeout(Duration::from_secs(timeout_secs))
-            .redirect(reqwest::redirect::Policy::limited(5))
-            .user_agent("cc-switch-speedtest/1.0")
-            .build()
-            .map_err(|e| {
-                AppError::localized(
-                    "speedtest.client_create_failed",
-                    format!("创建 HTTP 客户端失败: {e}"),
-                    format!("Failed to create HTTP client: {e}"),
-                )
-            })
+    fn build_client(timeout_secs: u64) -> Result<(Client, std::time::Duration), AppError> {
+        // 使用全局 HTTP 客户端（已包含代理配置）
+        // 返回 timeout Duration 供请求级别使用
+        let timeout = std::time::Duration::from_secs(timeout_secs);
+        Ok((crate::proxy::http_client::get(), timeout))
     }
 
     fn sanitize_timeout(timeout_secs: Option<u64>) -> u64 {

src-tauri/src/services/stream_check.rs

@@ -7,7 +7,7 @@ use regex::Regex;
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
 use serde_json::json;
-use std::time::{Duration, Instant};
+use std::time::Instant;
 
 use crate::app_config::AppType;
 use crate::error::AppError;
@@ -136,23 +136,36 @@ impl StreamCheckService {
             .extract_auth(provider)
             .ok_or_else(|| AppError::Message("未找到 API Key".to_string()))?;
 
-        let client = Client::builder()
-            .timeout(Duration::from_secs(config.timeout_secs))
-            .user_agent("cc-switch/1.0")
-            .build()
-            .map_err(|e| AppError::Message(format!("创建客户端失败: {e}")))?;
+        // 使用全局 HTTP 客户端（已包含代理配置）
+        let client = crate::proxy::http_client::get();
+        let request_timeout = std::time::Duration::from_secs(config.timeout_secs);
 
         let model_to_test = Self::resolve_test_model(app_type, provider, config);
 
         let result = match app_type {
             AppType::Claude => {
-                Self::check_claude_stream(&client, &base_url, &auth, &model_to_test).await
+                Self::check_claude_stream(
+                    &client,
+                    &base_url,
+                    &auth,
+                    &model_to_test,
+                    request_timeout,
+                )
+                .await
             }
             AppType::Codex => {
-                Self::check_codex_stream(&client, &base_url, &auth, &model_to_test).await
+                Self::check_codex_stream(&client, &base_url, &auth, &model_to_test, request_timeout)
+                    .await
             }
             AppType::Gemini => {
-                Self::check_gemini_stream(&client, &base_url, &auth, &model_to_test).await
+                Self::check_gemini_stream(
+                    &client,
+                    &base_url,
+                    &auth,
+                    &model_to_test,
+                    request_timeout,
+                )
+                .await
             }
         };
 
@@ -193,6 +206,7 @@ impl StreamCheckService {
         base_url: &str,
         auth: &AuthInfo,
         model: &str,
+        timeout: std::time::Duration,
     ) -> Result<(u16, String), AppError> {
         let base = base_url.trim_end_matches('/');
         let url = if base.ends_with("/v1") {
@@ -213,6 +227,7 @@ impl StreamCheckService {
             .header("x-api-key", &auth.api_key)
             .header("anthropic-version", "2023-06-01")
             .header("Content-Type", "application/json")
+            .timeout(timeout)
             .json(&body)
             .send()
             .await
@@ -243,6 +258,7 @@ impl StreamCheckService {
         base_url: &str,
         auth: &AuthInfo,
         model: &str,
+        timeout: std::time::Duration,
     ) -> Result<(u16, String), AppError> {
         let base = base_url.trim_end_matches('/');
         let url = if base.ends_with("/v1") {
@@ -275,6 +291,7 @@ impl StreamCheckService {
             .post(&url)
             .header("Authorization", format!("Bearer {}", auth.api_key))
             .header("Content-Type", "application/json")
+            .timeout(timeout)
             .json(&body)
             .send()
             .await
@@ -304,6 +321,7 @@ impl StreamCheckService {
         base_url: &str,
         auth: &AuthInfo,
         model: &str,
+        timeout: std::time::Duration,
     ) -> Result<(u16, String), AppError> {
         let base = base_url.trim_end_matches('/');
         let url = format!("{base}/v1/chat/completions");
@@ -320,6 +338,7 @@ impl StreamCheckService {
             .post(&url)
             .header("Authorization", format!("Bearer {}", auth.api_key))
             .header("Content-Type", "application/json")
+            .timeout(timeout)
             .json(&body)
             .send()
             .await