Fix provider validation and improve modular architecture support

[MCPClaude]

Summary

• Updates provider validation in index.ts to properly support both legacy and modular providers
• Improves documentation in config.ts for all supported providers
• Dynamically loads server version from package.json instead of using hardcoded value
• Enhances provider logging to show component types for composite providers
• Initializes providers explicitly at startup

Changes

• Fixed inconsistency where index.ts only validated 'keysender' but factory.ts supported 'autohotkey'
• Updated config.ts documentation to list all supported providers for each component
• Added explicit provider initialization at server startup
• Enhanced provider logging to show detailed information for composite providers
• Fixed hardcoded version number to use package.json value

Test plan

• Start server with default keysender provider
• Start server with autohotkey provider
• Test with modular provider configuration
• Verify correct provider information is displayed in logs

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