weibo: fix https://m.weibo.cn/detail/1234 urls not finding the artist.

Fix https://m.weibo.cn/detail/4506950043618873 type URLs not finding the
artist because the profile_url method returned nil instead of the actual
profile URL.

app/logical/sources/strategies/weibo.rb

@@ -53,13 +53,17 @@ module Sources
       end
 
       def profile_url
-        profile_urls.first
+        "https://www.weibo.com/u/#{artist_id}" if artist_id.present?
       end
 
       def artist_name
         api_response&.dig("user", "screen_name")
       end
 
+      def artist_id
+        parsed_url.artist_short_id || parsed_referer&.artist_short_id || api_response&.dig("user", "id")
+      end
+
       def artist_commentary_desc
         return if api_response.blank?
 

test/unit/sources/weibo_test.rb

@@ -107,6 +107,7 @@ module Sources
 
         assert_equal("https://www.weibo.com/5501756072/J2UNKfbqV", @site.page_url)
         assert_equal("https://www.weibo.com/5501756072/J2UNKfbqV", @site.canonical_url)
+        assert_equal("https://www.weibo.com/u/5501756072", @site.profile_url)
         assert_equal(%w[fgo Alter组], @site.tags.map(&:first))
         assert_equal("阿尔托莉雅厨", @site.artist_name)
       end