fix: lazy load assets files to prevent startup failure

main.py

@@ -35,11 +35,22 @@ cache = Cache(app)
 
 
 
-# Load Assets
+# Load Assets (lazy loading to avoid startup failures)
+data_tw = None
+data_us = None
+
+def load_assets():
+    global data_tw, data_us
+    if data_tw is None:
+        try:
             with open('assets_tw.json') as f:
                 data_tw = json.load(f)
             with open('assets_us.json') as f:
                 data_us = json.load(f)
+        except FileNotFoundError as e:
+            print(f"Warning: Assets file not found: {e}")
+            data_tw = {}
+            data_us = {}
 
 def login_required():
     if not 'username' in session: