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/start.sh

@@ -0,0 +1,69 @@
+#!/bin/bash
+
+set -e
+
+# Cloudron etcd connection
+ETCD_HOST=${CLOUDRON_ETCD_HOST:-127.0.0.1}
+ETCD_PORT=${CLOUDRON_ETCD_PORT:-2379}
+
+echo "Etcd host: $ETCD_HOST"
+echo "Etcd port: $ETCD_PORT"
+
+# Wait for etcd to be ready
+echo "Waiting for etcd to be ready..."
+MAX_WAIT=30
+WAIT_TIME=0
+while ! curl -f "http://${ETCD_HOST}:${ETCD_PORT}/health" 2>/dev/null; do
+  if [ $WAIT_TIME -ge $MAX_WAIT ]; then
+    echo "Timeout waiting for etcd"
+    exit 1
+  fi
+  echo "Etcd is unavailable - sleeping ($WAIT_TIME/$MAX_WAIT)"
+  sleep 2
+  WAIT_TIME=$((WAIT_TIME+2))
+done
+
+echo "Etcd is ready!"
+
+# Create APISIX configuration file
+cat > /usr/local/apisix/conf/config.yaml << 'EOF'
+deployment:
+  role: traditional
+  role_traditional:
+    config_provider: etcd
+  admin:
+    port: 9180
+    allow_admin:
+      - 0.0.0.0/0
+    admin_key:
+      - ${ADMIN_KEY:-admin-key-secret-change-me}
+    admin_api_version: v3
+  etcd:
+    host:
+      - ${ETCD_HOST}
+    port: ${ETCD_PORT}
+    prefix: "/apisix"
+    timeout: 30
+  apisix:
+    ssl:
+      ssl_trusted_certificate: /etc/ssl/certs/ca-certificates.crt
+      ssl_protocols: "TLSv1.2 TLSv1.3"
+    node_listen: 9080
+    enable_ipv6: false
+    enable_admin_cors: true
+    enable_http2: true
+  nginx_config:
+    error_log: "logs/error.log"
+    error_log_level: "warn"
+    worker_processes: auto
+    worker_rlimit_nofile: 20480
+    event_worker_processes: 2
+    worker_shutdown_timeout: 240s
+EOF
+
+echo "APISIX configuration created at /usr/local/apisix/conf/config.yaml"
+cat /usr/local/apisix/conf/config.yaml
+
+# Start APISIX
+echo "Starting APISIX..."
+exec /usr/bin/apisix start