✨ feat(apps): add description field to all application data files

- add english and chinese description fields to all application data files
- standardize yaml formatting and indentation across all files
- remove BOM characters from several files
- fix tag indentation in multiple files
- update architecture field formatting in DecoTV and wechat-selkies
- fix crossVersionUpdate value from False to false in gitlab applications
- improve description field formatting in billion-mail application

apps/yourls/data.yml

@@ -10,6 +10,9 @@ additionalProperties:
     - Tool
   shortDescZh: PHP驱动的标准自托管URL缩短器
   shortDescEn: The de facto standard self hosted URL shortener in PHP
+  description:
+    en: The de facto standard self hosted URL shortener in PHP
+    zh: PHP驱动的标准自托管URL缩短器
   type: tool
   crossVersionUpdate: true
   limit: 0