fix(data): null three non-Commons brand logo_url hotlinks

REDMAGIC (global.redmagic.gg), StarFive (starfivetech.com) and Ulefone
(cdn.shopify.com) linked their logos on company and shop CDN hosts we hold
no license for. Wikidata lists no logo (P154) for any of them, and the
Commons files for REDMAGIC and Ulefone are recent "own work" uploads of the
company marks, so they are not used either. Every remaining logo_url is a
Wikimedia Commons file.

Refs #296

Author: Seungpyo1007

data/brand/cn/redmagic.json

@@ -3,7 +3,7 @@
   "name": "REDMAGIC",
   "country": "CN",
   "founded_year": 2017,
-  "logo_url": "https://global.redmagic.gg/cdn/shop/files/RM_logo_100-100.png?v=1765867940",
+  "logo_url": null,
   "website": "https://global.redmagic.gg",
   "verified": false,
   "source_urls": [

data/brand/cn/starfive.json

@@ -3,7 +3,7 @@
   "name": "StarFive Technology",
   "country": "CN",
   "founded_year": 2018,
-  "logo_url": "https://www.starfivetech.com/uploadfile/202510/cdaefe2e0656fde.png",
+  "logo_url": null,
   "website": "https://www.starfivetech.com",
   "verified": false,
   "source_urls": [

data/brand/cn/ulefone.json

@@ -3,7 +3,7 @@
   "name": "Ulefone",
   "country": "CN",
   "founded_year": 2014,
-  "logo_url": "https://cdn.shopify.com/s/files/1/0830/0573/5193/files/logo_500x.png?v=1701397216",
+  "logo_url": null,
   "website": "https://www.ulefone.com",
   "verified": false,
   "source_urls": [