refactor: move setup.sh back to project root directory

Setup Script Restoration - Complete:
✅ SETUP SCRIPT MOVED: Restored setup.sh to project root directory
- setup.sh: Moved from scripts/utils/ back to /opt/aitbc/ (project root)
- Reason: Main project setup script belongs in root for easy access
- Impact: Improves project setup experience and follows standard conventions

✅ ROOT DIRECTORY ENHANCED:
📁 setup.sh: Main project setup script (9.8KB)
📋 Purpose: Sets up AITBC services on new host with systemd
🔧 Functionality: Complete project initialization and configuration
📍 Location: Project root for maximum accessibility

✅ DOCUMENTATION UPDATED:
📚 Development Guidelines: Added setup.sh to essential root files
📖 Test Documentation: Updated to reference root setup.sh
🎯 Usage Instructions: Added ./setup.sh to test prerequisites
📝 Clear Guidance: Updated script location references

✅ SETUP SCRIPT CONTENTS:
🎯 Main Function: AITBC Local Setup Script
🔧 Features: Sets up AITBC services with systemd
📋 Capabilities: Service configuration, user setup, permissions
🎨 Interface: Colored output with logging functions
⚙️ Error Handling: Comprehensive error checking and reporting

✅ IMPROVED PROJECT STRUCTURE:
📁 Root Directory: Now contains essential setup.sh
📁 scripts/utils/: Contains utility scripts (not main setup)
📖 Documentation: Updated to reflect correct locations
🎯 User Experience: Easier project setup with ./setup.sh

✅ STANDARD PRACTICES:
📍 Root Location: Main setup scripts typically in project root
🔧 Easy Access: Developers expect ./setup.sh in root
📦 Complete Setup: Single script for full project initialization
🎯 First Step: Clear entry point for new developers

BENEFITS:
✅ Better UX: Easy to find and run ./setup.sh
✅ Standard Practice: Follows common project conventions
✅ Clear Entry Point: Single script for project setup
✅ Documentation: Updated to reflect correct locations
✅ Accessibility: Setup script in most accessible location

RESULT: Successfully moved setup.sh back to project root directory, improving project setup experience and following standard conventions while updating all relevant documentation.

docs/advanced/05_development/DEVELOPMENT_GUIDELINES.md

@@ -12,6 +12,7 @@
 - `poetry.lock` - Dependency lock file
 - `pytest.ini` - Test configuration
 - `scripts/testing/run_all_tests.sh` - Main test runner
+- `setup.sh` - Main project setup script
 
 ### Development Scripts → `dev/scripts/`
 ```bash