feat: add system health diagnostics

backend/app/system_health/dependencies.py

@@ -0,0 +1,9 @@
+"""Dependency construction for System Health."""
+
+from app.system_health.adapters import RedisHealthAdapter
+from app.system_health.repository import SystemHealthRepository
+from app.system_health.service import SystemHealthService
+
+
+def get_system_health_service() -> SystemHealthService:
+    return SystemHealthService(SystemHealthRepository(), RedisHealthAdapter())