feat: add React frontend with auth, project list, import, and project detail pages

Converts packages/web from vanilla TypeScript Vite scaffold to React with:
- React 19, react-router-dom v7, @tanstack/react-query v5, Tailwind CSS v4
- JWT auth context with auto-refresh token support
- Login/Register pages, protected Layout with auth guard
- Projects list with grid cards and delete action
- ImportDialog supporting URL or file upload with API key display
- ProjectDetail with 4 tabs: Documentation, Modules, MCP Integration, Settings
- All TypeScript compiles cleanly (noEmit check passes)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/web/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "web",
+  "name": "@agent-fox/web",
   "private": true,
   "version": "0.0.0",
   "type": "module",
@@ -9,7 +9,18 @@
     "preview": "vite preview"
   },
   "devDependencies": {
+    "@tailwindcss/vite": "^4.2.2",
+    "@types/react": "^19.2.14",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^6.0.1",
+    "tailwindcss": "^4.2.2",
     "typescript": "~5.9.3",
     "vite": "^8.0.1"
+  },
+  "dependencies": {
+    "@tanstack/react-query": "^5.96.1",
+    "react": "^19.2.4",
+    "react-dom": "^19.2.4",
+    "react-router-dom": "^7.13.2"
   }
 }