Implement Template Library with Default Templates

[aydarng]

Create the foundation template library by converting existing workflow+config pairs into a unified template format.

Tasks

• Create template data structure and TypeScript interfaces
• Create conversion utility to transform YAML+JSON pairs to template format
• Convert existing workflow+config pairs
• Create template loading service (src/services/templateService.ts)
• Store templates in src/data/templates/ directory
• Add template metadata (name, description, category, complexity, estimated time)

Acceptance Criteria

• All existing workflow+config pairs are converted to template format
• Template service can load all default templates
• Template structure includes all required metadata fields