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/api/failover.ts

@@ -0,0 +1,73 @@
+import { invoke } from "@tauri-apps/api/core";
+import type {
+  ProviderHealth,
+  CircuitBreakerConfig,
+  CircuitBreakerStats,
+} from "@/types/proxy";
+
+export interface Provider {
+  id: string;
+  name: string;
+  settingsConfig: unknown;
+  websiteUrl?: string;
+  category?: string;
+  createdAt?: number;
+  sortIndex?: number;
+  notes?: string;
+  meta?: unknown;
+  icon?: string;
+  iconColor?: string;
+  isProxyTarget?: boolean;
+}
+
+export const failoverApi = {
+  // 获取代理目标列表
+  async getProxyTargets(appType: string): Promise<Provider[]> {
+    return invoke("get_proxy_targets", { appType });
+  },
+
+  // 设置代理目标
+  async setProxyTarget(
+    providerId: string,
+    appType: string,
+    enabled: boolean,
+  ): Promise<void> {
+    return invoke("set_proxy_target", { providerId, appType, enabled });
+  },
+
+  // 获取供应商健康状态
+  async getProviderHealth(
+    providerId: string,
+    appType: string,
+  ): Promise<ProviderHealth> {
+    return invoke("get_provider_health", { providerId, appType });
+  },
+
+  // 重置熔断器
+  async resetCircuitBreaker(
+    providerId: string,
+    appType: string,
+  ): Promise<void> {
+    return invoke("reset_circuit_breaker", { providerId, appType });
+  },
+
+  // 获取熔断器配置
+  async getCircuitBreakerConfig(): Promise<CircuitBreakerConfig> {
+    return invoke("get_circuit_breaker_config");
+  },
+
+  // 更新熔断器配置
+  async updateCircuitBreakerConfig(
+    config: CircuitBreakerConfig,
+  ): Promise<void> {
+    return invoke("update_circuit_breaker_config", { config });
+  },
+
+  // 获取熔断器统计信息
+  async getCircuitBreakerStats(
+    providerId: string,
+    appType: string,
+  ): Promise<CircuitBreakerStats | null> {
+    return invoke("get_circuit_breaker_stats", { providerId, appType });
+  },
+};

src/lib/api/settings.ts

@@ -115,4 +115,15 @@ export const settingsApi = {
   async getAutoLaunchStatus(): Promise<boolean> {
     return await invoke("get_auto_launch_status");
   },
+
+  async getToolVersions(): Promise<
+    Array<{
+      name: string;
+      version: string | null;
+      latest_version: string | null;
+      error: string | null;
+    }>
+  > {
+    return await invoke("get_tool_versions");
+  },
 };

src/lib/api/skills.ts

@@ -19,31 +19,17 @@ export interface SkillRepo {
   enabled: boolean;
 }
 
-export type AppType = "claude" | "codex" | "gemini";
-
 export const skillsApi = {
-  async getAll(app: AppType = "claude"): Promise<Skill[]> {
-    if (app === "claude") {
-      return await invoke("get_skills");
-    }
-    return await invoke("get_skills_for_app", { app });
+  async getAll(): Promise<Skill[]> {
+    return await invoke("get_skills");
   },
 
-  async install(directory: string, app: AppType = "claude"): Promise<boolean> {
-    if (app === "claude") {
-      return await invoke("install_skill", { directory });
-    }
-    return await invoke("install_skill_for_app", { app, directory });
+  async install(directory: string): Promise<boolean> {
+    return await invoke("install_skill", { directory });
   },
 
-  async uninstall(
-    directory: string,
-    app: AppType = "claude",
-  ): Promise<boolean> {
-    if (app === "claude") {
-      return await invoke("uninstall_skill", { directory });
-    }
-    return await invoke("uninstall_skill_for_app", { app, directory });
+  async uninstall(directory: string): Promise<boolean> {
+    return await invoke("uninstall_skill", { directory });
   },
 
   async getRepos(): Promise<SkillRepo[]> {