feat: implement WebSocket for real-time trial updates

- Create standalone WebSocket server (ws-server.ts) on port 3001 using Bun
- Add ws_connections table to track active connections in database
- Create global WebSocket manager that persists across component unmounts
- Fix useWebSocket hook to prevent infinite re-renders and use refs
- Fix TrialForm Select components with proper default values
- Add trialId to WebSocket URL for server-side tracking
- Update package.json with dev:ws script for separate WS server

package.json

@@ -11,7 +11,8 @@
     "db:push": "drizzle-kit push",
     "db:studio": "drizzle-kit studio",
     "db:seed": "bun db:push && bun scripts/seed-dev.ts",
-    "dev": "next dev --turbo",
+    "dev": "bun run ws-server.ts & next dev --turbo",
+    "dev:ws": "bun run ws-server.ts",
     "docker:up": "if [ \"$(uname)\" = \"Darwin\" ]; then colima start; fi && docker compose up -d",
     "docker:down": "docker compose down && if [ \"$(uname)\" = \"Darwin\" ]; then colima stop; fi",
     "format:check": "prettier --check \"**/*.{ts,tsx,js,jsx,mdx}\" --cache",
@@ -134,4 +135,4 @@
     "sharp",
     "unrs-resolver"
   ]
-}
+}