feat(perception): backend - mock event store, perception service, /perception API routes

backend/app/api/routes/__init__.py

@@ -6,6 +6,7 @@ from .documents import router as documents_router
 from .knowledge import router as knowledge_router
 from .agent import router as agent_router
 from .status import router as status_router
+from .perception import router as perception_router
 # Keep package boundaries explicit so backend imports stay predictable.
 
 
@@ -18,6 +19,7 @@ api_router.include_router(knowledge_router)
 api_router.include_router(agent_router)
 api_router.include_router(compliance_router)
 api_router.include_router(status_router)
+api_router.include_router(perception_router)
 
 __all__ = [
     "api_router",
@@ -26,4 +28,5 @@ __all__ = [
     "agent_router",
     "compliance_router",
     "status_router",
+    "perception_router",
 ]