Initial commit: _deploy_app skill

Deploy new apps or push updates to existing deployments via
Docker Compose + Caddy + Gitea webhooks. Multi-server profiles,
auto-detection of deployment status, full infrastructure provisioning.

- SKILL.md: 715-line workflow documentation
- scripts/detect_deployment.py: deployment status detection
- scripts/validate_compose.py: compose file validation
- references/: infrastructure, compose patterns, Caddy patterns
- assets/: Makefile and compose templates
- config.json: mew server profile

assets/docker-compose.template.yaml

@@ -0,0 +1,21 @@
+# Template: Replace {app_name}, {image}, and {port} with actual values
+services:
+  {app_name}:
+    image: {image}
+    container_name: {app_name}
+    restart: unless-stopped
+    # Uncomment if building from Dockerfile:
+    # build: .
+    env_file:
+      - .env
+    networks:
+      - proxy
+      - default
+    # Uncomment and set the internal port:
+    # expose:
+    #   - "{port}"
+
+networks:
+  proxy:
+    name: proxy
+    external: true