ci: add Gitea Actions workflow + production compose

- .gitea/workflows/deploy.yml: build, push to Gitea registry, SSH deploy
- docker-compose.prod.yml: pulls pre-built image from registry (for server)
- docker-compose.yml: kept for local development (builds from source)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.prod.yml

@@ -0,0 +1,39 @@
+services:
+  db:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: letsbe
+      POSTGRES_USER: ${POSTGRES_USER:-letsbe}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD in .env}
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-letsbe} -d letsbe"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  app:
+    image: code.letsbe.solutions/letsbe/letsbebiz-site:latest
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:3000:3000"
+    environment:
+      DATABASE_URI: postgresql://${POSTGRES_USER:-letsbe}:${POSTGRES_PASSWORD}@db:5432/letsbe
+      PAYLOAD_SECRET: ${PAYLOAD_SECRET}
+      NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_SITE_URL:-https://staging.letsbe.biz}
+      NEXT_PUBLIC_CALCOM_URL: ${NEXT_PUBLIC_CALCOM_URL:-}
+      SMTP_HOST: ${SMTP_HOST:-}
+      SMTP_PORT: ${SMTP_PORT:-587}
+      SMTP_USER: ${SMTP_USER:-}
+      SMTP_PASS: ${SMTP_PASS:-}
+      SMTP_FROM: ${SMTP_FROM:-hello@letsbe.biz}
+      ADMIN_EMAIL: ${ADMIN_EMAIL:-hello@letsbe.biz}
+      OPENROUTER_API_KEY: ${OPENROUTER_API_KEY:-}
+    depends_on:
+      db:
+        condition: service_healthy
+
+volumes:
+  pgdata: