Add generate-schema command for JSON schema generation

[httpdss]

Description

This PR adds a new generate-schema command that generates JSON schema definitions for available structure templates.

Features

• New Command: struct generate-schema command
• Flexible Input: Supports scanning built-in contribs directory and custom structures path
• Output Options: Can output to stdout or save to a specified file
• JSON Schema Generation: Creates a properly formatted JSON schema with PluginList enum

Usage

# Generate schema to stdout
struct generate-schema

# Generate schema with custom structures path
struct generate-schema -s /path/to/structures

# Save schema to file
struct generate-schema -o schema.json

# Combine custom path and output file
struct generate-schema -s /path/to/structures -o schema.json

Implementation Details

• Scans YAML files in the contribs directory and optional custom structures path
• Removes file extensions and creates relative paths for structure names
• Generates JSON schema with sorted enum values for consistency
• Includes proper error handling and logging
• Creates output directories if they don't exist

Files Changed

• struct_module/commands/generate_schema.py - New command implementation
• struct_module/main.py - Updated to register the new command
• docs/generate-schema.md - Added documentation for the new command

This enhancement makes it easier for users and tools to discover available structure templates programmatically.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.20%. Comparing base (d2c4cd5) to head (60343c1).
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Additional details and impacted files

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  Files          21       21           
  Lines         980      980           
  Branches      141      141           
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  Hits          590      590           
  Misses        365      365           
  Partials       25       25           

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