fix(todos): Literal types pour status/priority/days, Field default_factory pour tags

backend/app/schemas/todos.py

@@ -1,6 +1,7 @@
 import uuid
 from datetime import datetime
-from pydantic import BaseModel, ConfigDict
+from typing import Literal
+from pydantic import BaseModel, ConfigDict, Field
 
 
 class TodoCreate(BaseModel):
@@ -9,9 +10,9 @@ class TodoCreate(BaseModel):
     url: str | None = None
     domain: str | None = None
     category: str | None = None
-    tags: list[str] = []
-    status: str = "pending"
-    priority: str = "medium"
+    tags: list[str] = Field(default_factory=list)
+    status: Literal["pending", "done", "cancelled"] = "pending"
+    priority: Literal["low", "medium", "high"] = "medium"
     due_date: datetime | None = None
 
 
@@ -22,13 +23,13 @@ class TodoUpdate(BaseModel):
     domain: str | None = None
     category: str | None = None
     tags: list[str] | None = None
-    status: str | None = None
-    priority: str | None = None
+    status: Literal["pending", "done", "cancelled"] | None = None
+    priority: Literal["low", "medium", "high"] | None = None
     due_date: datetime | None = None
 
 
 class PostponeRequest(BaseModel):
-    days: int  # 1 ou 7
+    days: Literal[1, 7]
 
 
 class TodoResponse(BaseModel):