perf: optimize Twenty CRM resource usage

- Reduce defaults: 4 CPU/8GB → 2 CPU/4GB (official min is 2GB)
- Node.js heap: 512MB server, 384MB worker (runtime)
- Build-time heap: 3072MB (only during compilation)
- PG pool: reduce to 5 connections
- PostgreSQL: tune shared_buffers/work_mem/effective_cache_size
- Redis: cap at 64MB with noeviction policy
- Unset NODE_OPTIONS after build to not leak into runtime

frontend/public/json/twenty.json

@@ -19,8 +19,8 @@
             "type": "default",
             "script": "ct/twenty.sh",
             "resources": {
-                "cpu": 4,
-                "ram": 8192,
+                "cpu": 2,
+                "ram": 4096,
                 "hdd": 20,
                 "os": "Debian",
                 "version": "13"