feat: bootstrap admin auth, DB schema, and encrypted API keys

- Add Prisma schema for AdminUser, Source, Article, SearchRule, SearchRun,
  and encrypted ApiKey storage.
- Implement JWT session middleware and admin login/logout.
- Add AES-256-GCM encryption helpers for API keys.
- Seed default news sources and admin credentials.
- Create admin shell layout and login page.

package.json

@@ -6,21 +6,43 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "db:migrate": "prisma migrate dev",
+    "db:seed": "prisma db seed",
+    "db:generate": "prisma generate",
+    "db:studio": "prisma studio"
+  },
+  "prisma": {
+    "seed": "tsx prisma/seed.ts"
   },
   "dependencies": {
+    "@prisma/client": "^6.19.3",
+    "@radix-ui/react-slot": "^1.3.0",
+    "bcryptjs": "^3.0.3",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "date-fns": "^4.4.0",
+    "jose": "^6.2.3",
+    "lucide-react": "^1.20.0",
     "next": "16.2.9",
+    "node-cron": "^4.2.1",
+    "openai": "^6.43.0",
+    "prisma": "^6.19.3",
     "react": "19.2.4",
-    "react-dom": "19.2.4"
+    "react-dom": "19.2.4",
+    "tailwind-merge": "^3.6.0"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@types/bcryptjs": "^2.4.6",
     "@types/node": "^20",
+    "@types/node-cron": "^3.0.11",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "eslint": "^9",
     "eslint-config-next": "16.2.9",
     "tailwindcss": "^4",
+    "tsx": "^4.22.4",
     "typescript": "^5"
   }
 }