Add interactive mode and SkipConfirmation support to Add-AzBootstrapEnvironment

[Copilot]

This PR aligns Add-AzBootstrapEnvironment with Invoke-AzBootstrap by adding interactive mode support, SkipConfirmation parameter, and intelligent defaults from existing project configuration.

Key Changes

Interactive Mode Support

• Automatic detection: Function enters interactive mode when required parameters are missing
• Intelligent defaults: Reads existing .azbootstrap.jsonc configuration to suggest appropriate defaults based on project patterns
• User-friendly prompts: Guides users through parameter entry with contextual help

SkipConfirmation Parameter

• Added -SkipConfirmation switch parameter to bypass confirmation prompts
• Enables automation scenarios while maintaining safety for manual use
• Consistent with Invoke-AzBootstrap behavior

Configuration Integration

• Local config reading: New Get-AzBootstrapLocalConfig function reads repository .azbootstrap.jsonc
• Project pattern detection: Automatically derives naming conventions from existing environments
• Global config integration: Respects global location defaults from ~/.azbootstrap-globals.jsonc

Example Usage

Interactive Mode (new)

# Prompts for missing parameters with intelligent defaults
Add-AzBootstrapEnvironment -EnvironmentName "prod"

Non-Interactive Mode with Confirmation (existing, enhanced)

# Shows summary and prompts for confirmation
Add-AzBootstrapEnvironment -EnvironmentName "test" -ResourceGroupName "rg-myapp-test" -Location "eastus" -PlanManagedIdentityName "mi-myapp-test-plan"

Automated Mode (new)

# Bypasses confirmation for automation
Add-AzBootstrapEnvironment -EnvironmentName "test" -ResourceGroupName "rg-myapp-test" -Location "eastus" -PlanManagedIdentityName "mi-myapp-test-plan" -SkipConfirmation

Implementation Details

New Functions

• Get-AzBootstrapLocalConfig: Reads and parses repository .azbootstrap.jsonc files
• Start-AzBootstrapEnvironmentInteractiveMode: Handles interactive parameter collection with defaults

Updated Functions

• Add-AzBootstrapEnvironment: Enhanced with interactive mode, confirmation prompts, and configuration integration
• Made ResourceGroupName, Location, and PlanManagedIdentityName optional to enable interactive mode

Testing

• Added comprehensive test coverage (10 new tests)
• All existing functionality preserved (31 total tests passing)
• Tests cover both interactive detection and non-interactive modes

Documentation

• Updated README.md with new usage examples
• Enhanced DESIGN.md with architectural details
• Examples show both interactive and automated workflows

Backward Compatibility

• Existing scripts continue to work unchanged
• All parameter defaults and behaviors preserved
• Only new functionality added, no breaking changes

Fixes #51.

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