Add reset password to admin panel

backend/app/schemas/admin.py

@@ -9,6 +9,10 @@ class BanUserRequest(BaseModel):
     banned_until: datetime | None = None  # None = permanent ban
 
 
+class AdminResetPasswordRequest(BaseModel):
+    new_password: str = Field(..., min_length=6, max_length=100)
+
+
 class AdminUserResponse(BaseModel):
     id: int
     login: str