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/config.yaml.example

@@ -0,0 +1,95 @@
+# APISIX Configuration Sample
+# This file is automatically generated by Cloudron package
+# Located at: /usr/local/apisix/conf/config.yaml
+
+deployment:
+  role: traditional
+  role_traditional:
+    config_provider: etcd
+
+  admin:
+    # Admin API port
+    port: 9180
+
+    # Allow admin access from all IPs
+    # Restrict this in production to specific IPs
+    allow_admin:
+      - 0.0.0.0/0
+
+    # Admin API key (CHANGE THIS IN PRODUCTION)
+    admin_key:
+      - admin-key-secret-change-me
+
+    # Admin API version
+    admin_api_version: v3
+
+  etcd:
+    # Etcd hosts (automatically configured by Cloudron)
+    host:
+      - 127.0.0.1
+    port: 2379
+    prefix: "/apisix"
+    timeout: 30
+
+  apisix:
+    # SSL configuration
+    ssl:
+      ssl_trusted_certificate: /etc/ssl/certs/ca-certificates.crt
+      ssl_protocols: "TLSv1.2 TLSv1.3"
+
+    # Main HTTP proxy port
+    node_listen: 9080
+
+    # Disable IPv6
+    enable_ipv6: false
+
+    # Enable CORS for admin API
+    enable_admin_cors: true
+
+    # Enable HTTP/2
+    enable_http2: true
+
+  # Nginx configuration
+  nginx_config:
+    # Error log file
+    error_log: "logs/error.log"
+    error_log_level: "warn"
+
+    # Worker processes
+    worker_processes: auto
+
+    # Maximum open files
+    worker_rlimit_nofile: 20480
+
+    # Event worker processes
+    event_worker_processes: 2
+
+    # Worker shutdown timeout
+    worker_shutdown_timeout: 240s
+
+# Additional configuration options:
+#
+# Plugin configuration (default plugins enabled)
+# plugins:
+#   - real-ip
+#   - proxy-rewrite
+#   - limit-req
+#   - limit-conn
+#   - prometheus
+#   - node-status
+#   - jwt-auth
+#   - key-auth
+#   - basic-auth
+#   - ip-restriction
+#   - cors
+#   - proxy-cache
+#   - limit-count
+#   - request-id
+#   - fault-injection
+#   - consumer
+#
+# Stream plugins (for TCP/UDP):
+# stream_plugins:
+#   - mqtt-proxy
+#   - ip-restriction
+#   - limit-conn