Add Docker support

- Dockerfile: multi-stage Python 3.12 slim build
- docker-compose.yml: app + PostgreSQL 16 with healthcheck
- requirements.txt: fastapi, uvicorn, psycopg, passlib, jose
- .dockerignore: exclude venv, pycache, secrets
- app.py: env-based DB config (DB_HOST/PORT/NAME/USER/PASSWORD)
- README: Docker deploy instructions

README.md

@@ -76,3 +76,45 @@ Migrations are tracked in the `_migrations` table. Safe to run repeatedly.
 | Monthly Report | 1st 07:00 | `POST /api/send-report/monthly` |
 
 Dashboard handles all SMTP send + recipient resolution.
+
+## Docker Deployment
+
+```bash
+# Build and start (app + PostgreSQL)
+docker compose up -d
+
+# Set a custom DB password
+DB_PASSWORD=mysecretpassword docker compose up -d
+
+# View logs
+docker compose logs -f app
+
+# Stop
+docker compose down
+
+# Reset (destroy DB volume)
+docker compose down -v
+```
+
+### Environment variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `DB_HOST` | `db` | PostgreSQL host |
+| `DB_PORT` | `5432` | PostgreSQL port |
+| `DB_NAME` | `jetour-bi` | Database name |
+| `DB_USER` | `jetour` | Database user |
+| `DB_PASSWORD` | `jetour` | Database password |
+| `JWT_SECRET` | `change-me-in-production` | JWT signing secret |
+| `SMTP_HOST` | (empty) | SMTP server for email reports |
+| `SMTP_PORT` | `587` | SMTP port |
+| `SMTP_USER` | (empty) | SMTP username |
+| `SMTP_PASS` | (empty) | SMTP password |
+| `SMTP_FROM` | `reports@jetour.mu` | From address |
+
+### Ports
+
+| Service | Port | Description |
+|---------|------|-------------|
+| Dashboard | `8765` | Web UI |
+| PostgreSQL | `5433` | Mapped from container `5432` |