docs: enrich documentation with comprehensive guides

- Add comprehensive architecture documentation covering:
  * System overview and layered architecture
  * Component interactions and data flow
  * Extension points for custom models
  * Design patterns and best practices

- Significantly expand getting started tutorial with:
  * Detailed installation instructions including uv and MCC detector
  * Step-by-step guide for detection and correction models
  * Complete workflow examples with error handling
  * GPU acceleration setup
  * Batch processing patterns
  * Integration examples

- Add troubleshooting guide addressing:
  * Installation and dependency issues
  * Detection problems (no card detected, insufficient patches)
  * Correction issues (poor results, model errors)
  * Performance and memory optimization
  * GPU troubleshooting
  * Comprehensive FAQ section

- Update MkDocs navigation to include new documentation pages

Author: claude