feat: add SpecDialog component for editing spec frontmatter

- Implement SpecDialog for managing spec details including title, read mode, priority, and keywords.
- Add validation and keyword management functionality.
- Integrate SpecDialog into SpecsSettingsPage for editing specs.

feat: create index file for specs components

- Export SpecCard, SpecDialog, and related types from a new index file for better organization.

feat: implement SpecsSettingsPage for managing specs and hooks

- Create main settings page with tabs for Project Specs, Personal Specs, Hooks, Injection, and Settings.
- Integrate SpecDialog and HookDialog for editing specs and hooks.
- Add search functionality and mock data for specs and hooks.

feat: add spec management API routes

- Implement API endpoints for listing specs, getting spec details, updating frontmatter, rebuilding indices, and initializing the spec system.
- Handle errors and responses appropriately for each endpoint.

ccw/frontend/src/router.tsx

@@ -37,6 +37,7 @@ import {
   TeamPage,
   TerminalDashboardPage,
   AnalysisPage,
+  SpecsSettingsPage,
 } from '@/pages';
 
 /**
@@ -146,6 +147,10 @@ const routes: RouteObject[] = [
         path: 'settings/rules',
         element: <RulesManagerPage />,
       },
+      {
+        path: 'settings/specs',
+        element: <SpecsSettingsPage />,
+      },
       {
         path: 'settings/codexlens',
         element: <CodexLensManagerPage />,