Implement password change functionality and initialize superuser

qwen3-tts-backend/schemas/user.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 from typing import Optional
-from pydantic import BaseModel, EmailStr, Field, field_validator, ConfigDict
+from pydantic import BaseModel, EmailStr, Field, field_validator, model_validator, ConfigDict
 import re
 
 class UserBase(BaseModel):
@@ -89,3 +89,25 @@ class Token(BaseModel):
 
 class TokenData(BaseModel):
     username: Optional[str] = None
+
+class PasswordChange(BaseModel):
+    current_password: str = Field(..., min_length=1)
+    new_password: str = Field(..., min_length=8, max_length=128)
+    confirm_password: str = Field(..., min_length=8, max_length=128)
+
+    @field_validator('new_password')
+    @classmethod
+    def validate_password_strength(cls, v: str) -> str:
+        if not re.search(r'[A-Z]', v):
+            raise ValueError('Password must contain at least one uppercase letter')
+        if not re.search(r'[a-z]', v):
+            raise ValueError('Password must contain at least one lowercase letter')
+        if not re.search(r'\d', v):
+            raise ValueError('Password must contain at least one digit')
+        return v
+
+    @model_validator(mode='after')
+    def passwords_match(self) -> 'PasswordChange':
+        if self.new_password != self.confirm_password:
+            raise ValueError('Passwords do not match')
+        return self