feat(plugins): add main window plugins hub

[zerob13]

Summary

• add main-window /plugins routes with top tabs for Plugins, Skills, and MCP
• move visible entry points for Plugins-owned pages out of Settings while keeping compatibility redirects
• update expanded sidebar commands and workspace grouping
• fold Remote channels into plugin catalog cards; remote detail uses unified /plugins/:pluginId virtual ids such as remote:telegram
• use plugin-style top-level enable/disable controls for Remote virtual plugin detail pages
• merge Feishu/Lark Remote configuration into the Feishu/Lark Integration detail page
• use the Feishu/Lark Integration top-level enable control for both the official plugin and Feishu/Lark Remote
• auto-enable legacy remote channel configs when credentials/accounts exist and no explicit enabled flag was stored

UI Layout

Before:

AppBar
├─ rail
└─ expanded sidebar
   ├─ 所有 Agents
   ├─ search input
   ├─ pinned sessions
   └─ projects

After:

AppBar
├─ rail
└─ expanded sidebar
   ├─ 所有 Agents
   ├─ New Chat
   ├─ Search
   ├─ Plugins
   │
   ├─ Pinned, if any
   ├─ Chat
   └─ 工作区 + project sort toggle

Main content
└─ /plugins
   ├─ [Plugins] [Skills] [MCP]
   ├─ catalog: official plugins + Remote virtual plugins
   └─ detail: /plugins/:pluginId

Validation

• pnpm run format
• pnpm run i18n
• pnpm run lint
• pnpm run typecheck
• pnpm exec vitest run test/main/presenter/remoteControlPresenter/remoteBindingStore.test.ts test/renderer/components/WindowSideBar.test.ts test/renderer/components/RemoteSettings.test.ts
• pnpm exec vitest run test/renderer/components/WindowSideBar.test.ts test/renderer/components/McpIndicator.test.ts test/renderer/components/McpSettings.test.ts test/renderer/components/RemoteSettings.test.ts test/renderer/components/WelcomePage.test.ts test/renderer/lib/storeInitializer.test.ts
• pnpm exec vitest run test/renderer/components/OfficialPluginDetailPage.test.ts test/renderer/components/RemoteSettings.test.ts

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/plugins-hub-plan

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