feat: add full OpenAPI semantic analysis to API analyzer

- Add OpenAPI semantic diff analysis (endpoints, schemas, parameters)
- Add proto file change detection (messages, RPCs)
- Add controller endpoint extraction from Kotlin annotations
- Match full functionality of original gdc-nas-diff-analyzer.py
- Default to 200 commits analysis
- Generate clickable JIRA ticket links
- Categorize changes by SDK impact area

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: tychtjan