Refactor/simplify proxy logs (#585)

* 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

* 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

src-tauri/src/proxy/failover_switch.rs

@@ -86,17 +86,17 @@ impl FailoverSwitchManager {
         let app_enabled = match self.db.get_proxy_config_for_app(app_type).await {
             Ok(config) => config.enabled,
             Err(e) => {
-                log::warn!("[Failover] 无法读取 {app_type} 配置: {e}，跳过切换");
+                log::warn!("[FO-002] 无法读取 {app_type} 配置: {e}，跳过切换");
                 return Ok(false);
             }
         };
 
         if !app_enabled {
-            log::info!("[Failover] {app_type} 未被代理接管（enabled=false），跳过切换");
+            log::debug!("[Failover] {app_type} 未启用代理，跳过切换");
             return Ok(false);
         }
 
-        log::info!("[Failover] 开始切换供应商: {app_type} -> {provider_name} ({provider_id})");
+        log::info!("[FO-001] 切换: {app_type} → {provider_name}");
 
         // 1. 更新数据库 is_current
         self.db.set_current_provider(app_type, provider_id)?;
@@ -117,7 +117,7 @@ impl FailoverSwitchManager {
                         .update_live_backup_from_provider(app_type, &provider)
                         .await
                     {
-                        log::warn!("[Failover] 更新 Live 备份失败: {e}");
+                        log::warn!("[FO-003] Live 备份更新失败: {e}");
                     }
                 }
 
@@ -138,12 +138,10 @@ impl FailoverSwitchManager {
                 "source": "failover"  // 标识来源是故障转移
             });
             if let Err(e) = app.emit("provider-switched", event_data) {
-                log::error!("[Failover] 发射供应商切换事件失败: {e}");
+                log::error!("[Failover] 发射事件失败: {e}");
             }
         }
 
-        log::info!("[Failover] 供应商切换完成: {app_type} -> {provider_name} ({provider_id})");
-
         Ok(true)
     }
 }