feat: enhance deployment and media handling

- Updated deployment configurations to disable Incremental Static Regeneration (ISR) and cache on demand pages for better performance control.
- Extended .gitignore to include deployment-specific directories, preventing unnecessary files from being tracked.
- Improved video handling in content by adding support for additional video types and enhancing video element attributes for better playback control.
- Refactored post retrieval logic to ensure channel information is correctly merged and SEO data is accurately assigned.
- Enhanced static file handling to include error handling and domain whitelisting for security and reliability.

src/components/item.astro

@@ -90,7 +90,8 @@ const timeago = datetime.isBefore(dayjs().subtract(1, 'w'))
     }
   }
 
-  .content :global(.tgme_widget_message_video) {
+  .content
+    :global(.tgme_widget_message_video, .tgme_widget_message_roundvideo) {
     aspect-ratio: 1 / 1;
   }