fix(api): align Phoenix stack with hub/NPM deploy (TLS edge, graphql-ws)

- tls-config: allow production HTTP when TERMINATE_TLS_AT_EDGE=1 (matches CT 7800)
- websocket: disable perMessageDeflate on graphql-ws server (RSV1 / proxy compatibility)
- server: remove unused @fastify/websocket (standalone ws + graphql-ws only)
- package: drop @fastify/websocket dependency; refresh lockfile
- .env.example: document HOST and TERMINATE_TLS_AT_EDGE for nginx-terminated TLS

Made-with: Cursor

api/package.json

@@ -24,7 +24,6 @@
   "dependencies": {
     "@apollo/server": "^4.9.5",
     "@as-integrations/fastify": "^1.1.0",
-    "@fastify/websocket": "^10.0.1",
     "@kubernetes/client-node": "^0.20.0",
     "bcryptjs": "^2.4.3",
     "dotenv": "^16.3.1",