Add batch presigned upload endpoint #6481

Job	Run time
Detect Changes	6s
Lint (Biome)	14s
Format (Cargo)	9s
Format (Biome)	8s
Typecheck	1m 28s
Rust cache (x86_64-apple-darwin, macos-latest)	2m 22s
Rust cache (aarch64-apple-darwin, macos-latest)	4m 7s
Rust cache (x86_64-pc-windows-msvc, windows-latest)	13m 36s
Build Desktop	-1s
Clippy	-1s
Verify Tauri plugin versions	-1s
	22m 7s

Provide feedback