feat(rathole,apisix): complete Rathole and APISIX Cloudron packages

- Fix Rathole download URL to use .zip format instead of .tar.gz
- Complete APISIX package using official apache/apisix:3.8.0-debian base image
- Add cloudron user creation for APISIX compatibility
- Both packages build successfully and follow KNELCloudron- naming convention
- Rathole: reverse proxy tunnel with proper binary download
- APISIX: API gateway with official Docker image base

CloudronPackages/APISIX/README.md

@@ -0,0 +1,33 @@
+# Package Template for Cloudron Apps
+
+This is a minimal template to package an application for Cloudron.
+
+## Docker Artifact Naming Convention
+
+All KNEL Cloudron packages follow the `KNELCloudron-` prefix convention:
+- **Development Images**: `<appname>:dev` (built locally for testing)
+- **Production Images**: `<appname>:latest` (final packaged versions)
+- **Container Names**: Use descriptive names like `<appname>-dev` for development containers
+
+## Template Usage
+
+Replace placeholders in files with your app specifics:
+- `io.knel.apisix` (e.g., com.example.myapp)
+- `Apache APISIX` (human name)
+- `9180` (default internal app port)
+- `5.0.0` (Cloudron base image tag, e.g., 5.0.0)
+
+Files
+- `CloudronManifest.json` – base manifest
+- `Dockerfile` – uses cloudron/base, non-root user, healthcheck
+- `start.sh` – startup script with addon detection examples
+- `nginx.conf` (optional) – example reverse proxy
+- `supervisord.conf` (optional) – process manager example
+- `config.yaml` (optional) – sample app config
+- `logo.png` – add your 512x512 PNG icon here (not provided in template)
+
+Usage
+1. Create a new package from this template using `scripts/new-package.sh`:
+   `scripts/new-package.sh MyApp --id com.example.myapp --title "My App" --port 3000`
+2. Adjust Dockerfile and start.sh to run your app.
+3. Build and test locally; then commit and push.