refactor(backend): update services and register OCR router

- router.py: register ocr_router with OCR tag
- ontology.py: update ontology service logic
- orchestrator.py: update orchestrator service logic
- user_agent.py: update user agent schema and service
- schemas/user_agent.py: update user agent data schemas

server/src/app/api/v1/router.py

@@ -8,6 +8,7 @@ from app.api.v1.endpoints.bootstrap import router as bootstrap_router
 from app.api.v1.endpoints.employees import router as employees_router
 from app.api.v1.endpoints.health import router as health_router
 from app.api.v1.endpoints.knowledge import router as knowledge_router
+from app.api.v1.endpoints.ocr import router as ocr_router
 from app.api.v1.endpoints.ontology import router as ontology_router
 from app.api.v1.endpoints.orchestrator import router as orchestrator_router
 from app.api.v1.endpoints.reimbursements import router as reimbursements_router
@@ -21,6 +22,7 @@ router.include_router(agent_assets_router, tags=["agent-assets"])
 router.include_router(agent_runs_router, tags=["agent-runs"])
 router.include_router(audit_logs_router, tags=["audit-logs"])
 router.include_router(knowledge_router, tags=["knowledge"])
+router.include_router(ocr_router, tags=["ocr"])
 router.include_router(ontology_router, tags=["ontology"])
 router.include_router(orchestrator_router, tags=["orchestrator"])
 router.include_router(employees_router, prefix="/employees", tags=["employees"])