Support bundled templates: detect template folder in py2app Resources or working dir

Co-authored-by: Copilot <[email protected]>

app.py

@@ -1,13 +1,29 @@
 from flask import Flask, render_template, jsonify
 from datetime import datetime, timezone, timedelta
 import os
+import sys
 from dotenv import load_dotenv
 
 load_dotenv()
 
 from clients import jellyfin
 
-app = Flask(__name__, template_folder=os.path.join(os.path.dirname(__file__), 'templates'))
+def _find_template_folder():
+    candidates = [
+        os.path.join(os.path.dirname(__file__), 'templates'),
+        os.path.join(os.path.dirname(sys.executable), '..', 'Resources', 'templates'),
+        os.path.join(os.getcwd(), 'templates'),
+    ]
+    for p in candidates:
+        try:
+            p_norm = os.path.normpath(os.path.abspath(p))
+            if os.path.isdir(p_norm):
+                return p_norm
+        except Exception:
+            continue
+    return os.path.join(os.path.dirname(__file__), 'templates')
+
+app = Flask(__name__, template_folder=_find_template_folder())
 
 PHT = timezone(timedelta(hours=8))