Migrate all command handlers to System.CommandLine 2.0.0-beta5 API

[Copilot]

This PR completes the migration of all command handlers from System.CommandLine 2.0.0-beta4 to 2.0.0-beta5, implementing the breaking API changes required for the new version.

Changes Made

Package Update

• Updated System.CommandLine package reference from 2.0.0-beta4.22272.1 to 2.0.0-beta5.25306.1

API Migration Patterns Applied

All 7 command handlers were systematically updated with the following changes:

Option Creation:

// Before (beta4)
var option = new Option<DirectoryInfo>(
    aliases: ["--project", "-p"],
    description: "Description here"
) { IsRequired = true };

// After (beta5)
var option = new Option<DirectoryInfo>("--project", "-p")
{
    Description = "Description here",
    Required = true
};

Command Setup:

// Before (beta4)
command.AddOption(option);
command.SetHandler(async (DirectoryInfo path) => { ... }, option);

// After (beta5)
command.Options.Add(option);
command.SetAction((ParseResult parseResult) =>
{
    var path = parseResult.GetValue(option);
    // ... handler logic
    return handlerMethod(path!);
});

Subcommands:

// Before (beta4)
parentCommand.AddCommand(subCommand);

// After (beta5)
parentCommand.Subcommands.Add(subCommand);

Updated Command Handlers

1. InitProjectCommandHandler - Basic option handling patterns
2. ExtractModelCommandHandler - Multiple boolean options with defaults
3. QueryModelCommandHandler - Simple command pattern
4. ShowObjectCommandHandler - Complex subcommands (table/view/storedprocedure)
5. ExportModelCommandHandler - File type options with default values
6. EnrichModelCommandHandler - Multiple subcommands with complex option handling
7. DataDictionaryCommandHandler - Nested subcommand structure with required options

Program.cs Updates

• Updated main command registration to use rootCommand.Subcommands.Add()
• Modified main method signature and invocation pattern for beta5 compatibility

Key API Changes

• ✅ IsRequired = true → Required = true
• ✅ AddOption() → Options.Add()
• ✅ AddCommand() → Subcommands.Add()
• ✅ SetHandler() → SetAction()
• ✅ Handler signatures now use ParseResult parameter
• ✅ parseResult.GetValue<T>(option) for retrieving option values
• ✅ ArgumentHelpName → HelpName property
• ✅ Option constructors use positional parameters, Description as property

Validation

• ✅ All command handlers compile without errors
• ✅ Project builds successfully with System.CommandLine 2.0.0-beta5
• ✅ Command structure and option handling preserved
• ✅ Subcommand hierarchies maintained (DataDictionary, EnrichModel, ShowObject)

The migration maintains full backward compatibility of the CLI interface while updating the internal implementation to use the new System.CommandLine beta5 API patterns.

Fixes #18.

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