Fix: Rename directory to remove & character causing shell issues

Renamed ebook_backend&admin_panel to ebook_backend_admin_panel
  The & character was being interpreted by shell as background
  process operator, causing 'Dockerfile not found' errors in Coolify.

ebook_backend_admin_panel/admin-backend/utils/template_loader.py

@@ -0,0 +1,8 @@
+from fastapi.templating import Jinja2Templates
+import os
+
+BASE_DIR = os.path.dirname(__file__)
+PARENT_DIR = os.path.abspath(os.path.join(BASE_DIR, "..", ".."))
+TEMPLATE_DIR = os.path.join(PARENT_DIR, "admin-frontend")
+
+templates = Jinja2Templates(directory=TEMPLATE_DIR)