H64ee redis (#4223)

* Added memory cache support to get_available_apps function

* Add memory cache initialization to pusher service

Initialize memory cache managers on startup and shutdown gracefully,
following the same pattern as the main backend service.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: beastoin

backend/pusher/main.py

@@ -5,6 +5,7 @@
 from fastapi import FastAPI
 
 from routers import pusher
+from database.cache import init_cache, shutdown_cache
 
 if os.environ.get('SERVICE_ACCOUNT_JSON'):
     service_account_info = json.loads(os.environ["SERVICE_ACCOUNT_JSON"])
@@ -25,3 +26,21 @@
 @app.get('/health')
 def health_check():
     return {"status": "healthy"}
+
+
+@app.on_event("startup")
+async def startup_event():
+    """Initialize cache managers on startup."""
+    try:
+        init_cache(max_memory_mb=100)
+        print("Cache managers initialized successfully")
+    except Exception as e:
+        print(f"Failed to initialize cache managers: {e}")
+        # Continue startup even if cache managers fail
+
+
+@app.on_event("shutdown")
+async def shutdown_event():
+    """Stop cache managers on shutdown."""
+    shutdown_cache()
+    print("Cache managers stopped")