fix: reduce rate limit to 5s, add 10s connection timeout

- Rate limit reduced from 30s to 5s for testing
- WebSocket setup times out after 10s instead of hanging forever
- Added connection logging

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(frontend)/api/gemini-token/route.ts

@@ -4,7 +4,7 @@ import { generateEphemeralToken } from '@/lib/gemini-live';
 // ─── Rate Limiting ────────────────────────────────────────────────────────────
 
 const rateLimitMap = new Map<string, number>();
-const RATE_LIMIT_MS = 30_000; // 1 token per 30 seconds per IP
+const RATE_LIMIT_MS = 5_000; // 1 token per 5 seconds per IP
 
 // ─── Health Check (GET — no rate limit) ──────────────────────────────────────