Feature/error request logging (#401)

* feat(proxy): add error mapper for HTTP status code mapping

- Add error_mapper.rs module to map ProxyError to HTTP status codes
- Implement map_proxy_error_to_status() for error classification
- Implement get_error_message() for user-friendly error messages
- Support all error types: upstream, timeout, connection, provider failures
- Include comprehensive unit tests for all mappings

* feat(proxy): enhance error logging with context support

- Add log_error_with_context() method for detailed error recording
- Support streaming flag, session_id, and provider_type fields
- Remove dead_code warning from log_error() method
- Enable comprehensive error request tracking in database

* feat(proxy): implement error capture and logging in all handlers

- Capture and log all failed requests in handle_messages (Claude)
- Capture and log all failed requests in handle_gemini (Gemini)
- Capture and log all failed requests in handle_responses (Codex)
- Capture and log all failed requests in handle_chat_completions (Codex)
- Record error status codes, messages, and latency for all failures
- Generate unique session_id for each request
- Support both streaming and non-streaming error scenarios

* style: fix clippy warnings and typescript errors

- Add allow(dead_code) for CircuitBreaker::get_state (reserved for future)
- Fix all uninlined format string warnings (27 instances)
- Use inline format syntax for better readability
- Fix unused import and parameter warnings in ProviderActions.tsx
- Achieve zero warnings in both Rust and TypeScript

* style: apply code formatting

- Remove trailing whitespace in misc.rs
- Add trailing comma in App.tsx
- Format multi-line className in ProviderCard.tsx

* feat(proxy): add settings button to proxy panel

Add configuration buttons in both running and stopped states to
provide easy access to proxy settings dialog.

* fix(speedtest): skip client build for invalid inputs

* chore(clippy): fix uninlined format args

* Merge branch 'main' into feature/error-request-logging

src/components/proxy/ProxyPanel.tsx

@@ -1,5 +1,12 @@
 import { useState } from "react";
-import { Activity, Clock, TrendingUp, Server, ListOrdered } from "lucide-react";
+import {
+  Activity,
+  Clock,
+  TrendingUp,
+  Server,
+  ListOrdered,
+  Settings,
+} from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { useProxyStatus } from "@/hooks/useProxyStatus";
 import { ProxySettingsDialog } from "./ProxySettingsDialog";
@@ -40,8 +47,19 @@ export function ProxyPanel() {
           <div className="space-y-6">
             <div className="rounded-lg border border-border bg-muted/40 p-4 space-y-4">
               <div>
-                <p className="text-xs text-muted-foreground">服务地址</p>
-                <div className="mt-2 flex flex-col gap-2 sm:flex-row sm:items-center">
+                <div className="flex items-center justify-between mb-2">
+                  <p className="text-xs text-muted-foreground">服务地址</p>
+                  <Button
+                    size="sm"
+                    variant="ghost"
+                    onClick={() => setShowSettings(true)}
+                    className="h-7 gap-1.5 text-xs"
+                  >
+                    <Settings className="h-3.5 w-3.5" />
+                    配置
+                  </Button>
+                </div>
+                <div className="flex flex-col gap-2 sm:flex-row sm:items-center">
                   <code className="flex-1 text-sm bg-background px-3 py-2 rounded border border-border/60">
                     http://{status.address}:{status.port}
                   </code>
@@ -190,9 +208,18 @@ export function ProxyPanel() {
             <p className="text-base font-medium text-foreground mb-1">
               代理服务已停止
             </p>
-            <p className="text-sm text-muted-foreground">
+            <p className="text-sm text-muted-foreground mb-4">
               使用右上角开关即可启动服务
             </p>
+            <Button
+              size="sm"
+              variant="outline"
+              onClick={() => setShowSettings(true)}
+              className="gap-1.5"
+            >
+              <Settings className="h-4 w-4" />
+              配置代理服务
+            </Button>
           </div>
         )}
       </section>