revert: undo infra perf tweaks from d9109fd, keep reliability fixes

Author: eftekin

backend/Dockerfile

@@ -41,4 +41,9 @@ USER appuser
 
 EXPOSE 8000
 
-CMD ["sh", "-c", "python -m uvicorn main:app --host 0.0.0.0 --port 8000 --workers ${UVICORN_WORKERS:-1} --proxy-headers --forwarded-allow-ips '*'"]
+CMD ["python", "-m", "uvicorn", "main:app", \
+    "--host", "0.0.0.0", \
+    "--port", "8000", \
+    "--workers", "4", \
+    "--proxy-headers", \
+    "--forwarded-allow-ips", "*"]

backend/main.py

@@ -6,7 +6,6 @@
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.middleware.gzip import GZipMiddleware
 
 from app.config import ALLOWED_ORIGINS, settings
 from app.database import close_db, init_db
@@ -54,9 +53,6 @@ async def lifespan(app: FastAPI):
     allow_headers=["*"],
 )
 
-# Compress response bodies to reduce payload size over slow networks.
-app.add_middleware(GZipMiddleware, minimum_size=500)
-
 # ── Routers ──────────────────────────────────────────────────────────────────
 app.include_router(exam_router)
 

backend/nginx.conf

@@ -26,20 +26,6 @@ server {
     listen 443 ssl;
     server_name api.halicexamgenius.app;
 
-    # ── Compression ─────────────────────────────────────────────────────
-    gzip on;
-    gzip_vary on;
-    gzip_proxied any;
-    gzip_comp_level 5;
-    gzip_min_length 512;
-    gzip_types
-        application/json
-        text/plain
-        text/css
-        application/javascript
-        text/xml
-        application/xml;
-
     # ── SSL certificates (managed by Certbot on the host) ────────────────
     ssl_certificate     /etc/letsencrypt/live/api.halicexamgenius.app/fullchain.pem;
     ssl_certificate_key /etc/letsencrypt/live/api.halicexamgenius.app/privkey.pem;