Add subscription link field to user model

- Add subscription_link column to users table (nullable, unique)
- Add SUBSCRIPTION_URL to config settings
- Update user creation to include subscription link from Remnawave
- Add support subscription ticket creation with formatted message
- Add "update link" button to main menu
- Refactor support subscription formatting to include user details

repositories/users.py

@@ -16,7 +16,11 @@ class UserRepository:
         return result.scalar_one_or_none()
 
     async def create_user(self, session: AsyncSession, user_data: NewUserDTO) -> User:
-        user = User(id=user_data.id, referal_id=user_data.referal)
+        user = User(
+            id=user_data.id,
+            referal_id=user_data.referal,
+            subscription_link=user_data.link,
+        )
         session.add(user)
         await session.commit()
 
@@ -32,3 +36,14 @@ class UserRepository:
 
         await session.commit()
         return user
+
+    async def update_user_link(
+        self, session: AsyncSession, user_id: int, link: str
+    ) -> Optional[User]:
+        user = await self.get_user_by_id(session, user_id=user_id)
+        if not user:
+            return None
+        user.subscription_link = link
+
+        await session.commit()
+        return user