Add comprehensive Azure PowerShell scripts for reservation management

[Copilot]

This PR adds a complete suite of PowerShell scripts to manage Azure reservations, enabling users to retrieve all reservations and recreate them as needed. The solution addresses infrastructure management requirements for the meinbus application deployment.

What's Added

Core Scripts

• Get-AzureReservations.ps1 - Retrieves all Azure reservations with detailed information including SKU, quantity, status, expiration dates, and optional utilization data. Exports to JSON for backup/recreation.
• Recreate-AzureReservations.ps1 - Recreates reservations from exported JSON configurations or manual parameters, with validation and WhatIf mode for safe testing.
• Manage-AzureReservations.ps1 - Unified management interface providing list, export, import, recreate, report, and backup operations through a single entry point.

Utilities & Support

• Common-Functions.ps1 - Shared utility functions for authentication, validation, configuration management, and HTML report generation.
• Setup-Prerequisites.ps1 - Automated setup script that installs required Azure PowerShell modules and validates the environment.
• Test-Scripts.ps1 - Comprehensive validation script ensuring all components work correctly with syntax checking and functional tests.

Configuration & Documentation

• config.json - Template configuration with default settings, subscription definitions, and common reservation scenarios.
• README.md - Complete documentation with usage examples, workflow guides, troubleshooting, and best practices.

Key Features

Complete Backup & Restore: Export all reservations to JSON and recreate them identically, enabling disaster recovery and environment migration.

Cross-Subscription Migration: Move reservations between subscriptions with proper validation and scope management.

Safe Testing: WhatIf mode shows exactly what would be created without making actual changes.

Rich Reporting: Generate HTML reports with utilization data, status summaries, and detailed reservation analysis.

Comprehensive Validation: All parameters are validated before execution with detailed error messages and troubleshooting guidance.

Usage Examples

# Get all reservations and export to backup
.\Get-AzureReservations.ps1 -OutputPath "backup.json"

# Test recreation without making changes  
.\Recreate-AzureReservations.ps1 -ConfigPath "backup.json" -WhatIf

# Recreate reservations in target subscription
.\Recreate-AzureReservations.ps1 -ConfigPath "backup.json" -SubscriptionId "target-sub-id"

# Generate comprehensive HTML report
.\Manage-AzureReservations.ps1 -Action Report -OutputPath "analysis.html"

Quality Assurance

All scripts pass comprehensive validation including:

• PowerShell syntax validation
• Parameter validation patterns
• Help content completeness
• Function definition verification
• Configuration file validity

The solution includes proper error handling, detailed logging, and follows PowerShell best practices for enterprise environments.

Updated .gitignore to exclude temporary output files (JSON exports, HTML reports) while preserving the template configuration file.

Original prompt

get all reservation powshell azure and recreat it

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