Update service ports in documentation and configuration files to 12000 for backend

README.md

@@ -42,7 +42,7 @@ cp .env.example .env
 
 ```bash
 cd backend
-uvicorn app.main:app --reload --port 8000
+uvicorn app.main:app --reload --port 12000
 ```
 
 ### Running the frontend

docs/7-deployment-view.md

@@ -13,7 +13,7 @@ Describes:
 │  ┌─────────────┐  ┌─────────────────────┐   │
 │  │  frontend   │  │      backend        │   │
 │  │  (Flask)    │  │    (FastAPI)        │   │
-│  │  :5000      │  │    :8000            │   │
+│  │  :5000      │  │    :12000            │   │
 │  └──────┬──────┘  └──────────┬──────────┘   │
 │         │                   │              │
 │         └────────┬──────────┘              │
@@ -32,9 +32,9 @@ Describes:
 **Mapping of Building Blocks to Infrastructure:**
 
 | Building Block  | Container / Process          | Port  |
-| --------------- | ---------------------------- | ---- |
+| --------------- | ---------------------------- | ----- |
 | Flask frontend  | `frontend`                   | 5000  |
-| FastAPI backend | `backend`                    | 8000 |
+| FastAPI backend | `backend`                    | 12000 |
 | DuckDB          | File on host (`data/app.db`) | —     |
 
 ## Infrastructure Level 2

docs/deployment/coolify.md

@@ -7,13 +7,13 @@ This guide covers deploying `ai.allucanget.biz` using [Coolify](https://coolify.
 The application consists of two Python services:
 
 | Service  | Framework         | Port  | Description                                |
-| -------- | ----------------- | ---- | ------------------------------------------ |
-| Backend  | FastAPI + uvicorn | 8000 | REST API, auth, AI generation, DuckDB      |
+| -------- | ----------------- | ----- | ------------------------------------------ |
+| Backend  | FastAPI + uvicorn | 12000 | REST API, auth, AI generation, DuckDB      |
 | Frontend | Flask + gunicorn  | 5000  | SSR web UI, session auth, proxy to backend |
 
 Coolify's built-in reverse proxy routes traffic:
 
-- `/api/*` → Backend (port 8000)
+- `/api/*` → Backend (port 12000)
 - `/` → Frontend (port 5000)
 
 ## Prerequisites
@@ -30,10 +30,10 @@ Coolify's built-in reverse proxy routes traffic:
 4. Choose the `main` branch
 5. Set **Build Pack** to `nixpacks`
 6. **CRITICAL: Set Base Directory to `/backend`** — this tells Nixpacks to look in the `backend/` subdirectory for `requirements.txt` and the Python application
-7. Set **Ports Exposed** to `8000`
+7. Set **Ports Exposed** to `12000`
 8. Set **Start Command** to:
    ```txt
-   uvicorn app.main:app --host 0.0.0.0 --port 8000
+   uvicorn app.main:app --host 0.0.0.0 --port 12000
    ```
 9. Click **Create Resource**
 
@@ -74,9 +74,9 @@ Add these as **Runtime** environment variables in Coolify:
 Add these as **Runtime** environment variables in Coolify:
 
 | Variable           | Description                               | Example                                                         |
-| ------------------ | ----------------------------------------- | -------------------------------------------------------------- |
+| ------------------ | ----------------------------------------- | --------------------------------------------------------------- |
 | `FLASK_SECRET_KEY` | Flask session cookie signing key          | Generate with `openssl rand -hex 32`                            |
-| `BACKEND_URL`      | Internal URL to reach the backend service | `http://localhost:8000` (or use Coolify's internal networking) |
+| `BACKEND_URL`      | Internal URL to reach the backend service | `http://localhost:12000` (or use Coolify's internal networking) |
 
 ## Step 3: Configure Reverse Proxy
 
@@ -85,7 +85,7 @@ Coolify provides a built-in reverse proxy. Configure routing rules:
 ### Backend Proxy Rules
 
 - **Domain**: `api.ai.allucanget.biz` (or subdomain of your choice)
-- **Port**: `8000`
+- **Port**: `12000`
 - **Path**: `/api/*` → forward to backend
 
 ### Frontend Proxy Rules
@@ -104,7 +104,7 @@ If you need custom Nginx configuration, create `nginx/coolify.conf`:
 
 # Backend API proxy
 location /api/ {
-    proxy_pass http://backend:8000;
+    proxy_pass http://backend:12000;
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -152,7 +152,7 @@ If you want to persist DuckDB data:
 ### Frontend can't reach backend
 
 - Ensure `BACKEND_URL` points to the correct internal URL
-- If both services are on the same Coolify server, use `http://localhost:8000`
+- If both services are on the same Coolify server, use `http://localhost:12000`
 - Check that the backend service is running and healthy
 
 ### CORS errors
@@ -191,13 +191,3 @@ All required environment variables:
 - [ ] Domain names configured
 - [ ] Health checks passing
 - [ ] Logs reviewed for errors
-
-## Nixpacks Configuration
-
-The project includes Nixpacks configuration files for both services:
-
-- `nixpacks.toml` — Shared configuration (Python version, packages)
-- `backend/nixpacks.toml` — Backend-specific (uvicorn, port 8000)
-- `frontend/nixpacks.toml` — Frontend-specific (gunicorn, port 5000)
-
-Nixpacks automatically detects Python projects and installs dependencies from `requirements.txt`. No additional configuration is needed for basic deployments.

frontend/app/config.py

@@ -4,6 +4,6 @@ import os
 
 class Config:
     SECRET_KEY = os.getenv("FLASK_SECRET_KEY", "dev-secret-change-in-production")
-    BACKEND_URL = os.getenv("BACKEND_URL", "http://localhost:8000")
+    BACKEND_URL = os.getenv("BACKEND_URL", "http://localhost:12000")
     SESSION_COOKIE_HTTPONLY = True
     SESSION_COOKIE_SAMESITE = "Lax"

nginx/coolify.conf

@@ -3,7 +3,7 @@
 
 # Backend API proxy
 upstream backend {
-    server 127.0.0.1:8000;
+    server 127.0.0.1:12000;
 }
 
 # Frontend proxy