feat: add APISIX Cloudron package (API-Gateway)

- Create Dockerfile wrapping official Apache APISIX image
- Add CloudronManifest.json with etcd addon and multiple TCP ports
- Create start.sh script with etcd wait and auto-configuration
- Include README.md with comprehensive usage documentation
- Add config.yaml.example for reference configuration
- Add CHANGELOG.md for version tracking
- Add logo.png (Apache APISIX branding)

APISIX is a dynamic, real-time, high-performance API Gateway
that provides rich traffic management features.

Package includes:
- Official Apache APISIX Docker image wrapper (143MB)
- Cloudron etcd addon integration for configuration storage
- Automatic etcd connection wait and configuration
- Multiple exposed ports (9180: Admin API, 9080: HTTP, 9443: HTTPS)
- 1024MB memory limit for gateway operations
- Comprehensive documentation with API usage examples
- Plugin configuration examples

Ports:
- 9180: Admin API port (REST API for configuration)
- 9080: HTTP proxy port (client requests)
- 9443: HTTPS proxy port (client requests with SSL)

Features supported:
- Dynamic configuration without restarts
- Multi-protocol (HTTP/HTTPS, TCP/UDP, Dubbo, MQTT, gRPC, WebSocket)
- Load balancing with multiple strategies
- Security (IP restrictions, JWT, API Key auth)
- Traffic management (rate limiting, circuit breaking, canary releases)
- 100+ plugins for extensibility
- AI Gateway capabilities for LLM workloads

💘 Generated with Crush

Assisted-by: GLM-4.7 via Crush <crush@charm.land>

Package-Workspace/API-Gateway/apisix/Dockerfile

@@ -0,0 +1,7 @@
+FROM apache/apisix:latest
+
+# Copy start script (already executable from host)
+COPY start.sh /start.sh
+
+# Start APISIX
+CMD ["/start.sh"]