feat: Implement Speed Test Function

* feat: add unified endpoint speed test for API providers

Add a comprehensive endpoint latency testing system that allows users to:
- Test multiple API endpoints concurrently
- Auto-select the fastest endpoint based on latency
- Add/remove custom endpoints dynamically
- View latency results with color-coded indicators

Backend (Rust):
- Implement parallel HTTP HEAD requests with configurable timeout
- Handle various error scenarios (timeout, connection failure, invalid URL)
- Return structured latency data with status codes

Frontend (React):
- Create interactive speed test UI component with auto-sort by latency
- Support endpoint management (add/remove custom endpoints)
- Extract and update Codex base_url from TOML configuration
- Integrate with provider presets for default endpoint candidates

This feature improves user experience when selecting optimal API endpoints,
especially useful for users with multiple provider options or proxy setups.

* refactor: convert endpoint speed test to modal dialog

- Transform EndpointSpeedTest component into a modal dialog
- Add "Advanced" button next to base URL input to open modal
- Support ESC key and backdrop click to close modal
- Apply Linear design principles: minimal styling, clean layout
- Remove unused showBaseUrlInput variable
- Implement same modal pattern for both Claude and Codex

* fix: prevent modal cascade closing when ESC is pressed

- Add state checks to prevent parent modal from closing when child modals (endpoint speed test or template wizard) are open
- Update ESC key handler dependencies to track all modal states
- Ensures only the topmost modal responds to ESC key

* refactor: unify speed test panel UI with project design system

UI improvements:
- Update modal border radius from rounded-lg to rounded-xl
- Unify header padding from px-6 py-4 to p-6
- Change speed test button color to blue theme (bg-blue-500) for consistency
- Update footer background from bg-gray-50 to bg-gray-100
- Style "Done" button as primary action button with blue theme
- Adjust footer button spacing and hover states

Simplify endpoint display:
- Remove endpoint labels (e.g., "Current Address", "Custom 1")
- Display only URL for cleaner interface
- Clean up all label-related logic:
  * Remove label field from EndpointCandidate interface
  * Remove label generation in buildInitialEntries function
  * Remove label handling in useEffect merge logic
  * Remove label generation in handleAddEndpoint
  * Remove label parameters from claudeSpeedTestEndpoints
  * Remove label parameters from codexSpeedTestEndpoints

* refactor: improve endpoint list UI consistency

- Show delete button for all endpoints on hover for uniform UI
- Change selected state to use blue theme matching main interface:
  * Blue border (border-blue-500) for selected items
  * Light blue background (bg-blue-50/dark:bg-blue-900/20)
  * Blue indicator dot (bg-blue-500/dark:bg-blue-400)
- Switch from compact list (space-y-px) to card-based layout (space-y-2)
- Add rounded corners to each endpoint item for better visual separation

* feat: persist custom endpoints to settings.json

- Extend AppSettings to store custom endpoints for Claude and Codex
- Add Tauri commands: get/add/remove/update custom endpoints
- Update frontend API with endpoint persistence methods
- Modify EndpointSpeedTest to load/save custom endpoints via API
- Track endpoint last used time for future sorting/cleanup
- Store endpoints per app type in settings.json instead of localStorage

* - feat(types): add Provider.meta and ProviderMeta (snake_case) with custom_endpoints map

- feat(provider-form): persist custom endpoints on provider create by merging EndpointSpeedTest’s custom URLs into meta.custom_endpoints on submit

- feat(endpoint-speed-test): add onCustomEndpointsChange callback emitting normalized custom URLs; wire it for both Claude/Codex modals

- fix(api): send alias param names (app/appType/app_type and provider_id/providerId) in Tauri invokes to avoid “missing providerId” with older backends

- storage: custom endpoints are stored in ~/.cc-switch/config.json under providers[<id>].meta.custom_endpoints (not in settings.json)

- behavior: edit flow remains immediate writes; create flow now writes once via addProvider, removing the providerId dependency during creation

* feat: add endpoint candidates support and code formatting improvements

- Add endpointCandidates field to ProviderPreset and CodexProviderPreset interfaces
- Integrate preset endpoint candidates into speed test endpoint selection
- Add multiple endpoint options for PackyCode providers (Claude & Codex)
- Apply consistent code formatting (trailing commas, line breaks)
- Improve template value type safety and readability

* refactor: improve endpoint management button UX

Replace ambiguous "Advanced" text with intuitive "Manage & Test" label accompanied by Zap icon, making the endpoint management panel entry point more discoverable and self-explanatory for both Claude and Codex configurations.

* - merge: merge origin/main, resolve conflicts and preserve both feature sets
- feat(tauri): register import/export and file dialogs; keep endpoint speed test and custom endpoints
- feat(api): add updateTrayMenu and onProviderSwitched; wire import/export APIs
- feat(types): extend global API declarations (import/export)
- chore(presets): GLM preset supports both new and legacy model keys
- chore(rust): add chrono dependency; refresh lockfile

---------

Co-authored-by: Jason <farion1231@gmail.com>

src-tauri/src/provider.rs

@@ -19,6 +19,9 @@ pub struct Provider {
     #[serde(skip_serializing_if = "Option::is_none")]
     #[serde(rename = "createdAt")]
     pub created_at: Option<i64>,
+    /// 供应商元数据（不写入 live 配置，仅存于 ~/.cc-switch/config.json）
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub meta: Option<ProviderMeta>,
 }
 
 impl Provider {
@@ -36,6 +39,7 @@ impl Provider {
             website_url,
             category: None,
             created_at: None,
+            meta: None,
         }
     }
 }
@@ -56,6 +60,14 @@ impl Default for ProviderManager {
     }
 }
 
+/// 供应商元数据
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct ProviderMeta {
+    /// 自定义端点列表（按 URL 去重存储）
+    #[serde(default, skip_serializing_if = "HashMap::is_empty")]
+    pub custom_endpoints: HashMap<String, crate::settings::CustomEndpoint>,
+}
+
 impl ProviderManager {
     /// 获取所有供应商
     pub fn get_all_providers(&self) -> &HashMap<String, Provider> {