fix: increase nginx client_max_body_size for resumable admin uploads

CHANGELOG.md

@@ -29,6 +29,7 @@
 - Updated media listing to read from the media table and return duration metadata with HH:MM:SS runtime formatting.
 - Removed Tailwind and Alpine runtime/build dependencies from the frontend package configuration and eliminated Tailwind directives/warnings during production build.
 - Enforced 2GB upload ceiling plus server-side media file type/size validation for admin uploads.
+- Increased nginx `client_max_body_size` to allow resumable admin upload chunks and prevent `413 Content Too Large` responses.
 
 ## [1.0.3] - 2026-08-03