Add initial project files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/schemas/user.py

@@ -0,0 +1,39 @@
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, EmailStr
+
+
+class UserCreate(BaseModel):
+    email: EmailStr
+    password: str
+    display_name: Optional[str] = None
+
+
+class UserUpdate(BaseModel):
+    display_name: Optional[str] = None
+    timezone: Optional[str] = None
+
+
+class PasswordChange(BaseModel):
+    current_password: str
+    new_password: str
+
+
+class UserResponse(BaseModel):
+    id: int
+    email: str
+    display_name: Optional[str]
+    timezone: str
+    created_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+
+
+class LoginRequest(BaseModel):
+    email: EmailStr
+    password: str