Feat/provider individual config (#663)

* refactor(ui): simplify UpdateBadge to minimal dot indicator

* feat(provider): add individual test and proxy config for providers

Add support for provider-specific model test and proxy configurations:

- Add ProviderTestConfig and ProviderProxyConfig types in Rust and TypeScript
- Create ProviderAdvancedConfig component with collapsible panels
- Update stream_check service to merge provider config with global config
- Proxy config UI follows global proxy style (single URL input)

Provider-level configs stored in meta field, no database schema changes needed.

* feat(ui): add failover toggle and improve proxy controls

- Add FailoverToggle component with slide animation
- Simplify ProxyToggle style to match FailoverToggle
- Add usage statistics button when proxy is active
- Fix i18n parameter passing for failover messages
- Add missing failover translation keys (inQueue, addQueue, priority)
- Replace AboutSection icon with app logo

* fix(proxy): support system proxy fallback and provider-level proxy config

- Remove no_proxy() calls in http_client.rs to allow system proxy fallback
- Add get_for_provider() to build HTTP client with provider-specific proxy
- Update forwarder.rs and stream_check.rs to use provider proxy config
- Fix EditProviderDialog.tsx to include provider.meta in useMemo deps
- Add useEffect in ProviderAdvancedConfig.tsx to sync expand state

Fixes #636
Fixes #583

* fix(ui): sync toast theme with app setting

* feat(settings): add log config management

Fixes #612
Fixes #514

* fix(proxy): increase request body size limit to 200MB

Fixes #666

* docs(proxy): update timeout config descriptions and defaults

Fixes #612

* fix(proxy): filter x-goog-api-key header to prevent duplication

* fix(proxy): prevent proxy recursion when system proxy points to localhost

Detect if HTTP_PROXY, HTTPS_PROXY, or ALL_PROXY environment variables
point to loopback addresses (localhost, 127.0.0.1), and bypass system
proxy in such cases to avoid infinite request loops.

* fix(i18n): add providerAdvanced i18n keys and fix failover toast parameter

- Add providerAdvanced.* i18n keys to en.json, zh.json, and ja.json
- Fix failover toggleFailed toast to pass detail parameter
- Remove Chinese fallback text from UI for English/Japanese users

* fix(tray): restore tray-provider events and enable Auto failover properly

- Emit provider-switched event on tray provider click (backward compatibility)
- Auto button now: starts proxy, takes over live config, enables failover

* fix(log): enable dynamic log level and single file mode

- Initialize log at Trace level for dynamic adjustment
- Change rotation strategy to KeepSome(1) for single file
- Set max file size to 1GB
- Delete old log file on startup for clean start

* fix(tray): fix clippy uninlined format args warning

Use inline format arguments: {app_type_str} instead of {}

* fix(provider): allow typing :// in endpoint URL inputs

Change input type from "url" to "text" to prevent browser
URL validation from blocking :// input.

Closes #681

* fix(stream-check): use Gemini native streaming API format

- Change endpoint from OpenAI-compatible to native streamGenerateContent
- Add alt=sse parameter for SSE format response
- Use x-goog-api-key header instead of Bearer token
- Convert request body to Gemini contents/parts format

* feat(proxy): add request logging for debugging

Add debug logs for outgoing requests including URL and body content
with byte size, matching the existing response logging format.

* fix(log): prevent usize underflow in KeepSome rotation strategy

KeepSome(n) internally computes n-2, so n=1 causes underflow.
Use KeepSome(2) as the minimum safe value.

src/i18n/locales/ja.json

@@ -208,6 +208,29 @@
         "responseGroup": "レスポンス整流",
         "thinkingSignature": "Thinking 署名整流",
         "thinkingSignatureDescription": "Claude API の thinking 署名検証エラーを自動修正"
+      },
+      "logConfig": {
+        "title": "ログ管理",
+        "description": "ログ出力レベルを制御",
+        "enabled": "ログを有効化",
+        "enabledDescription": "マスタースイッチ、オフにするとすべてのログが無効になります",
+        "level": "ログレベル",
+        "levelDescription": "出力する最小ログレベルを設定",
+        "levels": {
+          "error": "エラー",
+          "warn": "警告",
+          "info": "情報",
+          "debug": "デバッグ",
+          "trace": "トレース"
+        },
+        "levelHint": "ログレベルの説明：",
+        "levelDesc": {
+          "error": "重大なエラーのみ",
+          "warn": "エラー + 警告",
+          "info": "一般的な操作情報（デフォルト）",
+          "debug": "SSE ストリームとリクエスト/レスポンスを含む詳細情報",
+          "trace": "すべてのログ、最も詳細"
+        }
       }
     },
     "language": "言語",
@@ -427,6 +450,22 @@
     "testFailed": "速度テストに失敗しました: {{error}}",
     "status": "ステータス: {{code}}"
   },
+  "providerAdvanced": {
+    "testConfig": "モデルテスト設定",
+    "useCustomConfig": "個別設定を使用",
+    "testConfigDesc": "このプロバイダーに個別のモデルテストパラメータを設定します。無効の場合はグローバル設定を使用します。",
+    "testModel": "テストモデル",
+    "testModelPlaceholder": "空白の場合はグローバル設定を使用",
+    "timeoutSecs": "タイムアウト（秒）",
+    "testPrompt": "テストプロンプト",
+    "degradedThreshold": "低下閾値（ミリ秒）",
+    "maxRetries": "最大リトライ回数",
+    "proxyConfig": "プロキシ設定",
+    "useCustomProxy": "個別プロキシを使用",
+    "proxyConfigDesc": "このプロバイダーに個別のネットワークプロキシを設定します。無効の場合はシステムプロキシまたはグローバル設定を使用します。",
+    "proxyUsername": "ユーザー名（任意）",
+    "proxyPassword": "パスワード（任意）"
+  },
   "codexConfig": {
     "authJson": "auth.json (JSON) *",
     "authJsonPlaceholder": "{\n  \"OPENAI_API_KEY\": \"sk-your-api-key-here\"\n}",
@@ -1088,6 +1127,20 @@
     "circuitOpen": "サーキットオープン",
     "consecutiveFailures": "{{count}} 回連続失敗"
   },
+  "failover": {
+    "enabled": "{{app}} フェイルオーバーが有効になりました",
+    "disabled": "{{app}} フェイルオーバーが無効になりました",
+    "toggleFailed": "操作に失敗しました: {{detail}}",
+    "inQueue": "キュー内",
+    "addQueue": "追加",
+    "priority": {
+      "tooltip": "フェイルオーバー優先度 {{priority}}"
+    },
+    "tooltip": {
+      "enabled": "{{app}} フェイルオーバーが有効\n次の利用可能なプロバイダーに自動切り替え",
+      "disabled": "{{app}} フェイルオーバーを有効にする\n現在のプロバイダーが失敗した場合に自動切り替え"
+    }
+  },
   "proxy": {
     "panel": {
       "serviceAddress": "サービスアドレス",