feat(opencode): Phase 7 - Frontend TypeScript type definitions

- Add "opencode" to AppId type in lib/api/types.ts
- Extend McpApps interface with opencode field in types.ts
- Add OpenCode-specific types: OpenCodeModel, OpenCodeProviderOptions,
  OpenCodeProviderConfig, OpenCodeMcpServerSpec
- Add opencodeConfigDir to Settings interface
- Add importOpenCodeFromLive() to providersApi
- Fix type errors across components:
  - AppSwitcher: add opencode to icon/name mappings
  - McpFormModal: add opencode to enabledApps state
  - PromptFormModal/Panel: add opencode filename mapping
  - EndpointSpeedTest: add opencode timeout config
  - useBaseUrlState: add opencode to appType union
  - ProxyToggle: add opencode label
  - App.tsx: handle opencode fallback for SkillsPage
- Update ProxyTakeoverStatus with opencode field (always false)
- Fix test mocks in tests/msw/state.ts

src/components/providers/forms/EndpointSpeedTest.tsx

@@ -9,11 +9,12 @@ import { FullScreenPanel } from "@/components/common/FullScreenPanel";
 import type { CustomEndpoint, EndpointCandidate } from "@/types";
 
 // 端点测速超时配置（秒）
-const ENDPOINT_TIMEOUT_SECS = {
+const ENDPOINT_TIMEOUT_SECS: Record<AppId, number> = {
   codex: 12,
   claude: 8,
-  gemini: 8, // 新增 gemini
-} as const;
+  gemini: 8,
+  opencode: 8,
+};
 
 interface TestResult {
   url: string;

src/components/providers/forms/hooks/useBaseUrlState.ts

@@ -6,7 +6,7 @@ import {
 import type { ProviderCategory } from "@/types";
 
 interface UseBaseUrlStateProps {
-  appType: "claude" | "codex" | "gemini";
+  appType: "claude" | "codex" | "gemini" | "opencode";
   category: ProviderCategory | undefined;
   settingsConfig: string;
   codexConfig?: string;