Remove nginx service from Coolify stack; update deployment guide to use frontend service on port 12001

Co-authored-by: Copilot <copilot@github.com>

docker-compose.coolify.yml

@@ -37,18 +37,6 @@ services:
     expose:
       - "12001"
 
-  nginx:
-    image: nginx:alpine
-    volumes:
-      - ./nginx/docker-compose.conf:/etc/nginx/conf.d/default.conf:ro
-    depends_on:
-      - backend
-      - frontend
-    networks:
-      - app-network
-    expose:
-      - "80"
-
 networks:
   app-network:
     driver: bridge

docs/deployment/coolify.md

@@ -57,7 +57,7 @@ Use Coolify's **Docker Compose** resource with the dedicated compose file `docke
 3. Select the `ai.allucanget.biz` repository and `main` branch
 4. Set **Compose File** to `docker-compose.coolify.yml`
 5. Set **Base Directory** to `/`
-6. Select the `nginx` service as the public-facing service on port `80`
+6. Select the `frontend` service as the public-facing service on port `12001`
 7. Click **Create Resource**
 
 ### Step 2: Configure Environment Variables
@@ -76,11 +76,11 @@ Add these in Coolify before first deploy:
 
 ### Step 3: Configure Domain and Proxy
 
-1. Attach domain `ai.allucanget.biz` to `nginx` service
+1. Attach domain `ai.allucanget.biz` to the `frontend` service on port `12001`
 2. Enable **Auto HTTPS** in Coolify
-3. Let Coolify terminate TLS and forward traffic to `nginx:80`
+3. Coolify terminates TLS and forwards traffic directly to `frontend:12001`
 
-`docker-compose.coolify.yml` does not publish host ports `80/443`. This avoids conflicts with Coolify's own proxy while keeping backend and frontend reachable over internal Docker network.
+No nginx service is needed in the Coolify stack. The frontend Flask app proxies `/api/*` calls to `http://backend:12000` internally. Coolify's own reverse proxy handles external TLS termination.
 
 ### Step 4: Persistent Storage
 
@@ -222,8 +222,8 @@ If you want to persist DuckDB data:
 ### Docker Compose deployment fails in Coolify
 
 - Verify Coolify uses `docker-compose.coolify.yml`, not local `docker-compose.yml`
-- Verify public domain points to `nginx` service on port `80`
-- Do not publish host ports `80:80` or `443:443` inside Coolify stack
+- Verify public domain points to `frontend` service on port `12001`
+- Do not add `nginx` to the Coolify stack — bind-mounting a local config file will fail since the file doesn't exist on the Coolify server
 
 ### Backend healthcheck stays unhealthy
 
@@ -272,7 +272,7 @@ All required environment variables:
 
 - [ ] Repository pushed to Git
 - [ ] For Docker Compose: Coolify resource uses `docker-compose.coolify.yml`
-- [ ] For Docker Compose: domain points to `nginx` service on port `80`
+- [ ] For Docker Compose: domain points to `frontend` service on port `12001`
 - [ ] Backend service created with correct base directory (`/backend`)
 - [ ] Backend environment variables configured
 - [ ] Frontend service created with correct base directory (`/frontend`)