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/tsconfig.json

@@ -1,26 +1,16 @@
 {
   "compilerOptions": {
-    "target": "ES2023",
-    "useDefineForClassFields": true,
+    "target": "ES2022",
     "module": "ESNext",
-    "lib": ["ES2023", "DOM", "DOM.Iterable"],
-    "types": ["vite/client"],
-    "skipLibCheck": true,
-
-    /* Bundler mode */
     "moduleResolution": "bundler",
-    "allowImportingTsExtensions": true,
-    "verbatimModuleSyntax": true,
-    "moduleDetection": "force",
-    "noEmit": true,
-
-    /* Linting */
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
     "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "erasableSyntaxOnly": true,
-    "noFallthroughCasesInSwitch": true,
-    "noUncheckedSideEffectImports": true
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "jsx": "react-jsx",
+    "outDir": "dist"
   },
   "include": ["src"]
 }