[Docs] API docs: Add OpenAPI/Swagger docs for all service APIs

[OneByJorah]

API Documentation Checklist

• Document all service endpoints:
  • SearXNG API (port 8080): , ,
  • Camofox API (port 9377): , , , , ,
  • Qdrant API (port 6333): , , ,
  • Honcho API (port 8081): , , ,
  • Obsidian API (port 8083): Web UI endpoints
• Create OpenAPI/Swagger specs for each service
• Generate API reference docs (Redoc/Stoplight)
• Add API docs to repository (docs/api/)
• Link API docs from README.md
• Add API versioning strategy
• Document authentication/authorization for each API
• Add example requests/responses for each endpoint
• Set up automated API doc generation in CI