Refactor to manager-centric model, add team calendar for all users

Key changes:
- Removed office-centric model (deleted offices.py, office-rules)
- Renamed to team-rules, managers are part of their own team
- Team calendar visible to all (read-only for employees)
- Admins can have a manager assigned

app/routes/auth.py

@@ -22,7 +22,7 @@ class RegisterRequest(BaseModel):
     email: EmailStr
     password: str
     name: str
-    office_id: str | None = None
+    manager_id: str | None = None
 
 
 class LoginRequest(BaseModel):
@@ -39,7 +39,7 @@ class UserResponse(BaseModel):
     id: str
     email: str
     name: str | None
-    office_id: str | None
+    manager_id: str | None
     role: str
     manager_parking_quota: int | None = None
     week_start_day: int = 0
@@ -71,7 +71,7 @@ def register(data: RegisterRequest, db: Session = Depends(get_db)):
         email=data.email,
         password=data.password,
         name=data.name,
-        office_id=data.office_id
+        manager_id=data.manager_id
     )
 
     token = create_access_token(user.id, user.email)
@@ -116,7 +116,7 @@ def get_me(user=Depends(get_current_user)):
         id=user.id,
         email=user.email,
         name=user.name,
-        office_id=user.office_id,
+        manager_id=user.manager_id,
         role=user.role,
         manager_parking_quota=user.manager_parking_quota,
         week_start_day=user.week_start_day or 0,