Add comprehensive GitHub Copilot instructions for bloecks REDAXO addon

.github/copilot-instructions.md

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+# blÖcks REDAXO Addon
+
+Always follow these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.
+
+blÖcks is a REDAXO CMS addon that adds features to content modules including drag & drop reordering, cut & copy functionality, and online/offline status management. The addon uses a Node.js/Grunt build system for frontend asset compilation.
+
+## Working Effectively
+
+### Initial Setup
+- Bootstrap the development environment:
+  - Node.js v20+ and npm are pre-installed
+  - Run `npm install` -- takes ~35 seconds, may show vulnerabilities that don't affect functionality
+  - Grunt CLI is pre-installed globally
+
+### Build Process
+- **Development build with watch mode:**
+  - `grunt` -- NEVER CANCEL: runs build then starts watch mode indefinitely. Use Ctrl+C to stop when done.
+  - Processes LESS → CSS, concatenates/uglifies JS, syncs assets to correct directories
+  - Watch mode automatically rebuilds when source files change
+
+- **Production build:**
+  - `grunt --production` -- takes ~2 seconds, NEVER CANCEL: Set timeout to 30+ seconds
+  - Compresses CSS, uglifies JS, generates distribution-ready assets
+  - Does not include source maps
+
+### Asset Synchronization
+- `./rsync.sh` -- takes <1 second
+  - Syncs compiled assets from individual plugin directories to main assets directory
+  - Uses rsync.exclude file to filter files
+  - Required after manual asset changes
+
+### Release Management  
+- **Version updates:**
+  - `./version.sh "4.0.3"` -- DOES NOT WORK on Linux (macOS-specific sed syntax)
+  - Updates version numbers in .php and .yml files
+  - Document this limitation: "version.sh script fails on Linux due to macOS-specific sed syntax"
+
+- **Create release package:**
+  - `./zip.sh` -- takes ~2 seconds, NEVER CANCEL: Set timeout to 30+ seconds  
+  - Runs production build first, then creates zip file in parent directory
+  - Excludes development files (node_modules, assets_src, .git, etc.)
+  - Creates bloecks.zip ready for REDAXO installer
+
+## Validation
+
+### Build Validation
+- Always run `grunt --production` after making changes to verify assets compile correctly
+- Check that files are created in assets/css/ and assets/js/ directories
+- Verify plugin assets are synced to correct locations after rsync
+
+### Manual Testing Scenarios
+- This is a backend-focused addon - no frontend UI to test
+- Verify that build process completes without errors
+- Check that all LESS files compile to CSS without syntax errors
+- Confirm JavaScript files concatenate and uglify properly
+
+## File Structure & Navigation
+
+### Key Directories
+- `/lib/` - Core PHP classes (bloecks_abstract, bloecks_backend, Bloecks)  
+- `/assets_src/` - Source files for compilation (LESS, JS)
+- `/assets/` - Compiled output files (CSS, JS)
+- `/plugins/cutncopy/` - Cut & copy functionality plugin
+- `/plugins/dragndrop/` - Drag & drop reordering plugin
+- `/pages/` - Admin interface pages
+- `/lang/` - Translation files
+
+### Important Files
+- `package.yml` - Addon metadata and dependencies
+- `boot.php` - Addon initialization
+- `Gruntfile.js` - Build configuration
+- `package.json` - Node.js dependencies
+- `README.developers.md` - Development documentation (German)
+
+### Asset Processing
+- Source files in `**/assets_src/less/be.less` → compiled to `**/assets/css/be.css`
+- Source files in `**/assets_src/js/be/**/*.js` → concatenated to `**/assets/js/be.js`
+- Frontend files follow same pattern with `fe.less` and `fe/` directory
+- Plugin assets follow same structure within their directories
+
+## Common Tasks
+
+The following are validated commands and their expected outputs:
+
+### Install Dependencies
+```bash
+npm install
+# Takes ~35 seconds
+# Shows deprecation warnings and 14 vulnerabilities - these don't affect functionality
+# Use timeout of 60+ seconds
+```
+
+### Development Build
+```bash  
+grunt
+# Compiles assets then starts watch mode
+# Initial build takes ~2 seconds, then waits for file changes
+# Stop with Ctrl+C when done
+# NEVER CANCEL: Set timeout to indefinite for watch mode
+```
+
+### Production Build
+```bash
+grunt --production
+# Takes ~2 seconds
+# Outputs: "Done."
+# Creates minified, production-ready assets
+# NEVER CANCEL: Set timeout to 30+ seconds  
+```
+
+### Create Release
+```bash
+./zip.sh
+# Takes ~2 seconds total (includes grunt --production)
+# Creates ../bloecks.zip file ready for distribution
+# NEVER CANCEL: Set timeout to 30+ seconds
+```
+
+### Sync Assets
+```bash
+./rsync.sh  
+# Takes <1 second
+# No output on success
+```
+
+## Repository Information
+
+### Technology Stack
+- **Backend:** PHP 7+ (REDAXO CMS addon)
+- **Frontend Build:** Node.js, Grunt, LESS, UglifyJS
+- **Asset Management:** rsync for directory synchronization
+
+### Dependencies
+- REDAXO ^5.5.0
+- PHP >=7  
+- structure/content ^2.1.0
+- Node.js for build system
+
+### Plugin Architecture
+- `cutncopy` - Copy and paste content blocks between articles
+- `dragndrop` - Drag and drop reordering of content blocks
+- Status management was deprecated in v3.0.0 (now in REDAXO core)
+
+Always run production builds and asset sync after making changes to ensure compatibility with the REDAXO addon system.