feat(backend): add video_url and video_position to properties

- Model: video_url VARCHAR(512) nullable, video_position VARCHAR(20) default 'section'
- Migration: k3l4m5n6o7p8_add_video_to_properties
- Admin route: expose/accept video_url (sanitize empty->NULL) and video_position
- Public schema: PropertyDetailOut exposes both fields

backend/app/routes/admin.py

@@ -4,7 +4,7 @@ import re
 import bcrypt
 from datetime import datetime, date
 from decimal import Decimal
-from typing import Optional
+from typing import Optional, Literal
 from flask import Blueprint, request, jsonify, current_app, send_from_directory
 from werkzeug.utils import secure_filename
 from pydantic import BaseModel, ValidationError
@@ -168,6 +168,8 @@ class PropertyAdminOut(BaseModel):
     is_featured: bool
     photos: list[PhotoAdminOut] = []
     amenity_ids: list[int] = []
+    video_url: Optional[str] = None
+    video_position: Literal['carousel', 'section'] = 'section'
 
     @classmethod
     def from_prop(cls, p: Property) -> "PropertyAdminOut":
@@ -203,6 +205,8 @@ class PropertyAdminOut(BaseModel):
                 for ph in p.photos
             ],
             amenity_ids=[a.id for a in p.amenities],
+            video_url=p.video_url,
+            video_position=p.video_position,
         )
 
 
@@ -348,10 +352,15 @@ def admin_update_property(property_id: str):
         "area_m2",
         "city_id",
         "neighborhood_id",
+        "video_position",
     )
     for field in _SCALAR_FIELDS:
         if field in body:
             setattr(prop, field, body[field])
+    # video_url: sanitizar e tratar string vazia como NULL
+    if 'video_url' in body:
+        raw = body['video_url']
+        prop.video_url = raw.strip() if raw and raw.strip() else None
     # code: tratar string vazia como NULL
     if "code" in body:
         prop.code = body["code"] if body["code"] else None