Initial frontend implementation

- React dashboard with Tailwind CSS v4
- Session-based authentication (Lucia patterns)
- API client with axios
- Project, Task, and Agent views
- Bun.serve() with HMR and API proxy
- Docker support

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

server.ts

@@ -0,0 +1,73 @@
+import index from './public/index.html'
+
+const PORT = process.env.PORT || 3001
+const BACKEND_URL = process.env.BACKEND_URL || 'http://localhost:3000'
+
+Bun.serve({
+  port: PORT,
+  async fetch(req) {
+    const url = new URL(req.url)
+
+    // API proxy to backend
+    if (url.pathname.startsWith('/api/')) {
+      const backendUrl = `${BACKEND_URL}${url.pathname}${url.search}`
+      const headers = new Headers(req.headers)
+
+      // Forward cookies
+      const cookie = req.headers.get('cookie')
+      if (cookie) {
+        headers.set('cookie', cookie)
+      }
+
+      const backendReq = new Request(backendUrl, {
+        method: req.method,
+        headers,
+        body: req.method !== 'GET' && req.method !== 'HEAD' ? await req.text() : undefined,
+      })
+
+      const backendRes = await fetch(backendReq)
+
+      // Forward Set-Cookie headers
+      const setCookies = backendRes.headers.get('set-cookie')
+      const responseHeaders = new Headers(backendRes.headers)
+
+      if (setCookies) {
+        responseHeaders.set('set-cookie', setCookies)
+      }
+
+      return new Response(backendRes.body, {
+        status: backendRes.status,
+        statusText: backendRes.statusText,
+        headers: responseHeaders,
+      })
+    }
+
+    // Serve static files from public directory
+    if (url.pathname !== '/' && !url.pathname.includes('.')) {
+      // SPA routing - serve index.html for all non-file routes
+      return new Response(index, {
+        headers: {
+          'Content-Type': 'text/html',
+        },
+      })
+    }
+
+    // Serve index.html for root
+    if (url.pathname === '/') {
+      return new Response(index, {
+        headers: {
+          'Content-Type': 'text/html',
+        },
+      })
+    }
+
+    // Let Bun handle other static files
+    return new Response('Not Found', { status: 404 })
+  },
+  development: {
+    hmr: true,
+  },
+})
+
+console.log(`Frontend server running on http://localhost:${PORT}`)
+console.log(`Proxying API requests to ${BACKEND_URL}`)