weibo: fix bad artist name suggestions in new artist form.

Fix the new artist form suggesting invalid Chinese tag names for Weibo
artists. Suggest `weibo_123456` instead as a placeholder.

app/logical/source/extractor/weibo.rb

@@ -47,14 +47,14 @@ module Source
         end
       end
 
-      def profile_urls
-        [parsed_url.profile_url, parsed_referer&.profile_url].compact.uniq
-      end
-
       def profile_url
         "https://www.weibo.com/u/#{artist_id}" if artist_id.present?
       end
 
+      def tag_name
+        "weibo_#{artist_id}" if artist_id.present?
+      end
+
       def artist_name
         api_response&.dig("user", "screen_name")
       end

test/unit/sources/weibo_test.rb

@@ -120,6 +120,7 @@ module Sources
         artist_name: "号布谷鸟",
         artist_commentary_desc: "<a  href=\"https://m.weibo.cn/search?containerid=231522type%3D1%26t%3D10%26q%3D%23%E5%BF%AB%E9%80%92%E7%BB%84%23&extparam=%23%E5%BF%AB%E9%80%92%E7%BB%84%23&luicode=20000061&lfid=4767694689143828\" data-hide=\"\"><span class=\"surl-text\">#快递组#</span></a> 摸了 ",
         profile_url: "https://www.weibo.com/u/6582241007",
+        profile_urls: ["https://www.weibo.com/u/6582241007"],
         tags: ["快递组"]
       )
     end