✨ 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/yarr/data.yml

@@ -1,10 +1,13 @@
-additionalProperties:
+additionalProperties:
   key: yarr
   name: Yarr
   tags:
     - Tool
   shortDescZh: Rss 阅读器
   shortDescEn: Rss Reader
+  description:
+    en: Rss Reader
+    zh: Rss 阅读器
   type: tool
   crossVersionUpdate: true
   limit: 0