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/schemas.py

@@ -0,0 +1,47 @@
+from pydantic import BaseModel
+from typing import List
+
+class AdminLogin(BaseModel):
+    """
+    Schema for admin login credentials.
+
+    Attributes:
+        username (str): Admin username.
+        password (str): Admin password.
+    """
+    username: str
+    password: str
+
+
+class CodeItem(BaseModel):
+    """
+    Schema representing a coupon code and its usage count.
+
+    Attributes:
+        code (str): The coupon code.
+        usage (int): Number of times the code has been used.
+    """
+    code: str
+    usage: int
+
+
+class CouponUploadItem(BaseModel):
+    """
+    Schema for an individual coupon code to be uploaded.
+
+    Attributes:
+        code (str): The coupon code.
+        usage (int): Optional initial usage count (default is 0).
+    """
+    code: str
+    usage: int = 0
+
+
+class CouponUpload(BaseModel):
+    """
+    Schema for bulk coupon upload containing a list of coupon items.
+
+    Attributes:
+        codes (List[CouponUploadItem]): List of coupon entries.
+    """
+    codes: List[CouponUploadItem]