Add authentication system with session-based auth

- Implement register, login, logout, and me endpoints
- Use bcryptjs for password hashing
- HTTPOnly secure cookies for sessions (Lucia Auth pattern)
- Users and sessions tables with proper relations
- 7-day session duration with auto-expiry

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

package.json

@@ -15,6 +15,7 @@
     "format": "prettier --write src/**/*.ts"
   },
   "devDependencies": {
+    "@types/bcryptjs": "^3.0.0",
     "@types/bun": "latest",
     "@types/cors": "^2.8.19",
     "@types/express": "^5.0.6",
@@ -32,6 +33,7 @@
     "@kubernetes/client-node": "^1.4.0",
     "@modelcontextprotocol/sdk": "^1.25.2",
     "axios": "^1.13.2",
+    "bcryptjs": "^3.0.3",
     "bullmq": "^5.66.5",
     "cors": "^2.8.5",
     "dotenv": "^17.2.3",