Feat/auto failover (#367)

* feat(db): add circuit breaker config table and provider proxy target APIs

Add database support for auto-failover feature:

- Add circuit_breaker_config table for storing failover thresholds
- Add get/update_circuit_breaker_config methods in proxy DAO
- Add reset_provider_health method for manual recovery
- Add set_proxy_target and get_proxy_targets methods in providers DAO
  for managing multi-provider failover configuration

* feat(proxy): implement circuit breaker and provider router for auto-failover

Add core failover logic:

- CircuitBreaker: Tracks provider health with three states:
  - Closed: Normal operation, requests pass through
  - Open: Circuit broken after consecutive failures, skip provider
  - HalfOpen: Testing recovery with limited requests
- ProviderRouter: Routes requests across multiple providers with:
  - Health tracking and automatic failover
  - Configurable failure/success thresholds
  - Auto-disable proxy target after reaching failure threshold
  - Support for manual circuit breaker reset
- Export new types in proxy module

* feat(proxy): add failover Tauri commands and integrate with forwarder

Expose failover functionality to frontend:

- Add Tauri commands: get_proxy_targets, set_proxy_target,
  get_provider_health, reset_circuit_breaker,
  get/update_circuit_breaker_config, get_circuit_breaker_stats
- Register all new commands in lib.rs invoke handler
- Update forwarder with improved error handling and logging
- Integrate ProviderRouter with proxy server startup
- Add provider health tracking in request handlers

* feat(frontend): add failover API layer and TanStack Query hooks

Add frontend data layer for failover management:

- Add failover.ts API: Tauri invoke wrappers for all failover commands
- Add failover.ts query hooks: TanStack Query mutations and queries
  - useProxyTargets, useProviderHealth queries
  - useSetProxyTarget, useResetCircuitBreaker mutations
  - useCircuitBreakerConfig query and mutation
- Update queries.ts with provider health query key
- Update mutations.ts to invalidate health on provider changes
- Add CircuitBreakerConfig and ProviderHealth types

* feat(ui): add auto-failover configuration UI and provider health display

Add comprehensive UI for failover management:

Components:
- ProviderHealthBadge: Display provider health status with color coding
- CircuitBreakerConfigPanel: Configure failure/success thresholds,
  timeout duration, and error rate limits
- AutoFailoverConfigPanel: Manage proxy targets with drag-and-drop
  priority ordering and individual enable/disable controls
- ProxyPanel: Integrate failover tabs for unified proxy management

Provider enhancements:
- ProviderCard: Show health badge and proxy target indicator
- ProviderActions: Add "Set as Proxy Target" action
- EditProviderDialog: Add is_proxy_target toggle
- ProviderList: Support proxy target filtering mode

Other:
- Update App.tsx routing for settings integration
- Update useProviderActions hook with proxy target mutation
- Fix ProviderList tests for updated component API

* fix(usage): stabilize date range to prevent infinite re-renders

* feat(backend): add tool version check command

Add get_tool_versions command to check local and latest versions of
Claude, Codex, and Gemini CLI tools:

- Detect local installed versions via command line execution
- Fetch latest versions from npm registry (Claude, Gemini)
  and GitHub releases API (Codex)
- Return comprehensive version info including error details
  for uninstalled tools
- Register command in Tauri invoke handler

* style(ui): format accordion component code style

Apply consistent code formatting to accordion component:
- Convert double quotes to semicolons at line endings
- Adjust indentation to 2-space standard
- Align with project code style conventions

* refactor(providers): update provider card styling to use theme tokens

Replace hardcoded color classes with semantic design tokens:
- Use bg-card, border-border, text-card-foreground instead of glass-card
- Replace gray/white color literals with muted/foreground tokens
- Change proxy target indicator color from purple to green
- Improve hover states with border-border-active
- Ensure consistent dark mode support via CSS variables

* refactor(proxy): simplify auto-failover config panel structure

Restructure AutoFailoverConfigPanel for better integration:
- Remove internal Card wrapper and expansion toggle (now handled by parent)
- Extract enabled state to props for external control
- Simplify loading state display
- Clean up redundant CardHeader/CardContent wrappers
- ProxyPanel: reduce complexity by delegating to parent components

* feat(settings): enhance settings page with accordion layout and tool versions

Major settings page improvements:

AboutSection:
- Add local tool version detection (Claude, Codex, Gemini)
- Display installed vs latest version comparison with visual indicators
- Show update availability badges and environment check cards

SettingsPage:
- Reorganize advanced settings into collapsible accordion sections
- Add proxy control panel with inline status toggle
- Integrate auto-failover configuration with accordion UI
- Add database and cost calculation config sections

DirectorySettings & WindowSettings:
- Minor styling adjustments for consistency

settings.ts API:
- Add getToolVersions() wrapper for new backend command

* refactor(usage): restructure usage dashboard components

Comprehensive usage statistics panel refactoring:

UsageDashboard:
- Reorganize layout with improved section headers
- Add better loading states and empty state handling

ModelStatsTable & ProviderStatsTable:
- Minor styling updates for consistency

ModelTestConfigPanel & PricingConfigPanel:
- Simplify component structure
- Remove redundant Card wrappers
- Improve form field organization

RequestLogTable:
- Enhance table layout with better column sizing
- Improve pagination controls

UsageSummaryCards:
- Update card styling with semantic tokens
- Better responsive grid layout

UsageTrendChart:
- Refine chart container styling
- Improve legend and tooltip display

* chore(deps): add accordion and animation dependencies

Package updates:
- Add @radix-ui/react-accordion for collapsible sections
- Add cmdk for command palette support
- Add framer-motion for enhanced animations

Tailwind config:
- Add accordion-up/accordion-down animations
- Update darkMode config to support both selector and class
- Reorganize color and keyframe definitions for clarity

* style(app): update header and app switcher styling

App.tsx:
- Replace glass-header with explicit bg-background/80 backdrop-blur
- Update navigation button container to use bg-muted

AppSwitcher:
- Replace hardcoded gray colors with semantic muted/foreground tokens
- Ensure consistent dark mode support via CSS variables
- Add group class for better hover state transitions

src/lib/query/failover.ts

@@ -0,0 +1,116 @@
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { failoverApi } from "@/lib/api/failover";
+
+/**
+ * 获取代理目标列表
+ */
+export function useProxyTargets(appType: string) {
+  return useQuery({
+    queryKey: ["proxyTargets", appType],
+    queryFn: () => failoverApi.getProxyTargets(appType),
+    enabled: !!appType,
+  });
+}
+
+/**
+ * 获取供应商健康状态
+ */
+export function useProviderHealth(providerId: string, appType: string) {
+  return useQuery({
+    queryKey: ["providerHealth", providerId, appType],
+    queryFn: () => failoverApi.getProviderHealth(providerId, appType),
+    enabled: !!providerId && !!appType,
+    refetchInterval: 5000, // 每 5 秒刷新一次
+    retry: false,
+  });
+}
+
+/**
+ * 设置代理目标
+ */
+export function useSetProxyTarget() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: ({
+      providerId,
+      appType,
+      enabled,
+    }: {
+      providerId: string;
+      appType: string;
+      enabled: boolean;
+    }) => failoverApi.setProxyTarget(providerId, appType, enabled),
+    onSuccess: (_, variables) => {
+      // 刷新代理目标列表
+      queryClient.invalidateQueries({
+        queryKey: ["proxyTargets", variables.appType],
+      });
+      // 刷新供应商列表
+      queryClient.invalidateQueries({ queryKey: ["providers"] });
+      // 刷新健康状态
+      queryClient.invalidateQueries({
+        queryKey: ["providerHealth", variables.providerId, variables.appType],
+      });
+    },
+  });
+}
+
+/**
+ * 重置熔断器
+ */
+export function useResetCircuitBreaker() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: ({
+      providerId,
+      appType,
+    }: {
+      providerId: string;
+      appType: string;
+    }) => failoverApi.resetCircuitBreaker(providerId, appType),
+    onSuccess: (_, variables) => {
+      // 刷新健康状态
+      queryClient.invalidateQueries({
+        queryKey: ["providerHealth", variables.providerId, variables.appType],
+      });
+    },
+  });
+}
+
+/**
+ * 获取熔断器配置
+ */
+export function useCircuitBreakerConfig() {
+  return useQuery({
+    queryKey: ["circuitBreakerConfig"],
+    queryFn: () => failoverApi.getCircuitBreakerConfig(),
+  });
+}
+
+/**
+ * 更新熔断器配置
+ */
+export function useUpdateCircuitBreakerConfig() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: failoverApi.updateCircuitBreakerConfig,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["circuitBreakerConfig"] });
+    },
+  });
+}
+
+/**
+ * 获取熔断器统计信息
+ */
+export function useCircuitBreakerStats(providerId: string, appType: string) {
+  return useQuery({
+    queryKey: ["circuitBreakerStats", providerId, appType],
+    queryFn: () => failoverApi.getCircuitBreakerStats(providerId, appType),
+    enabled: !!providerId && !!appType,
+    refetchInterval: 5000, // 每 5 秒刷新一次
+  });
+}

src/lib/query/queries.ts

@@ -34,12 +34,22 @@ export interface ProvidersQueryData {
   currentProviderId: string;
 }
 
+export interface UseProvidersQueryOptions {
+  isProxyRunning?: boolean; // 代理服务是否运行中
+}
+
 export const useProvidersQuery = (
   appId: AppId,
+  options?: UseProvidersQueryOptions,
 ): UseQueryResult<ProvidersQueryData> => {
+  const { isProxyRunning = false } = options || {};
+
   return useQuery({
     queryKey: ["providers", appId],
     placeholderData: keepPreviousData,
+    // 当代理服务运行时，每 10 秒刷新一次供应商列表
+    // 这样可以自动反映后端熔断器自动禁用代理目标的变更
+    refetchInterval: isProxyRunning ? 10000 : false,
     queryFn: async () => {
       let providers: Record<string, Provider> = {};
       let currentProviderId = "";