feat: Dashboard with summary cards, health distribution, gateway trend, global search

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

backend/app/main.py

@@ -4,7 +4,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.database import engine, Base
-from app.api import auth, users, audit
+from app.api import auth, users, audit, dashboard
 from app.middleware.audit import AuditMiddleware
 
 
@@ -34,6 +34,7 @@ app.add_middleware(AuditMiddleware)
 app.include_router(auth.router)
 app.include_router(users.router)
 app.include_router(audit.router)
+app.include_router(dashboard.router, prefix="/api/v1")
 
 
 @app.get("/api/v1/health")