feat: add Skill Hub feature for managing community skills

- Implemented Skill Hub page with tabs for remote, local, and installed skills.
- Added localization support for Chinese in skill-hub.json.
- Created API routes for fetching remote skills, listing local skills, and managing installed skills.
- Developed functionality for installing and uninstalling skills from both remote and local sources.
- Introduced caching mechanism for remote skills and handling updates for installed skills.

ccw/src/core/server.ts

@@ -18,6 +18,7 @@ import { handleGraphRoutes } from './routes/graph-routes.js';
 import { handleSystemRoutes } from './routes/system-routes.js';
 import { handleFilesRoutes } from './routes/files-routes.js';
 import { handleSkillsRoutes } from './routes/skills-routes.js';
+import { handleSkillHubRoutes } from './routes/skill-hub-routes.js';
 import { handleCommandsRoutes } from './routes/commands-routes.js';
 import { handleIssueRoutes } from './routes/issue-routes.js';
 import { handleDiscoveryRoutes } from './routes/discovery-routes.js';
@@ -564,6 +565,11 @@ export async function startServer(options: ServerOptions = {}): Promise<http.Ser
         if (await handleSkillsRoutes(routeContext)) return;
       }
 
+      // Skill Hub routes (/api/skill-hub*)
+      if (pathname.startsWith('/api/skill-hub')) {
+        if (await handleSkillHubRoutes(routeContext)) return;
+      }
+
       // Commands routes (/api/commands*)
       if (pathname.startsWith('/api/commands')) {
         if (await handleCommandsRoutes(routeContext)) return;