Add in-memory read cache with CUD-based invalidation

backend/app/main.py

@@ -7,6 +7,7 @@ from app.api.internal_catalog import router as internal_catalog_router
 from app.api.internal import router as internal_router
 from app.api.me import router as me_router
 from app.core.config import get_settings
+from app.services.runtime_cache import runtime_cache
 
 app = FastAPI(title="memberapi.ose.tw", version="0.1.0")
 
@@ -20,6 +21,18 @@ app.add_middleware(
 )
 
 
+@app.middleware("http")
+async def invalidate_runtime_cache_on_cud(request, call_next):
+    response = await call_next(request)
+    if (
+        request.method in {"POST", "PUT", "PATCH", "DELETE"}
+        and request.url.path.startswith(("/admin", "/internal"))
+        and response.status_code < 400
+    ):
+        runtime_cache.bump_revision()
+    return response
+
+
 @app.get("/healthz", tags=["health"])
 def healthz() -> dict[str, str]:
     return {"status": "ok"}