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/src/services/websocket.ts

@@ -13,6 +13,7 @@ export function createWebSocketServer(httpServer: any, path: string) {
   const wss = new WebSocketServer({
     server: httpServer,
     path,
+    perMessageDeflate: false,
   })
 
   const serverCleanup = useServer(