Implement Backend API, MCP Server, and Gitea integration

- Add REST API routes for projects, tasks, and agents (CRUD operations)
- Implement MCP Server with 4 core tools:
  - get_next_task: Assign tasks to agents
  - update_task_status: Update task states
  - create_branch: Create Git branches via Gitea API
  - create_pull_request: Create PRs via Gitea API
- Add Gitea API client for repository operations
- Fix database migration error handling for existing tables
- Connect all routes to Bun.serve() main server

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

src/index.ts

@@ -5,6 +5,7 @@
 
 import { runMigrations } from './db/migrate'
 import { testConnection } from './db/client'
+import { handleProjectRoutes, handleTaskRoutes, handleAgentRoutes } from './api/routes'
 
 console.log('🚀 Starting AiWorker Backend...')
 console.log(`Bun version: ${Bun.version}`)
@@ -41,11 +42,43 @@ const server = Bun.serve({
     }
 
     // API routes
+    if (url.pathname.startsWith('/api/projects')) {
+      return handleProjectRoutes(req, url)
+    }
+
+    if (url.pathname.startsWith('/api/tasks')) {
+      return handleTaskRoutes(req, url)
+    }
+
+    if (url.pathname.startsWith('/api/agents')) {
+      return handleAgentRoutes(req, url)
+    }
+
+    // Generic API info
     if (url.pathname.startsWith('/api/')) {
       return Response.json({
         message: 'AiWorker API',
-        path: url.pathname,
-        method: req.method,
+        version: '1.0.0',
+        endpoints: [
+          'GET /api/health',
+          'GET /api/projects',
+          'GET /api/projects/:id',
+          'POST /api/projects',
+          'PATCH /api/projects/:id',
+          'DELETE /api/projects/:id',
+          'GET /api/tasks',
+          'GET /api/tasks/:id',
+          'POST /api/tasks',
+          'PATCH /api/tasks/:id',
+          'POST /api/tasks/:id/respond',
+          'DELETE /api/tasks/:id',
+          'GET /api/agents',
+          'GET /api/agents/:id',
+          'POST /api/agents',
+          'PATCH /api/agents/:id',
+          'POST /api/agents/:id/heartbeat',
+          'DELETE /api/agents/:id',
+        ],
       })
     }