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feat(file_storage): configurable bucket folder prefix + any S3 provider #280

Job	Run time
File size (300-line cap)	17s
Python lint & format	16s
Python tests	3m 0s
JS build (Vite)	34s
E2E smoke (Playwright)	1m 33s
Perf guards (Playwright)	1m 26s
JS lint & format	24s
JS typecheck	43s
Python typecheck	20s
JS tests (Vitest)	29s
Package build (release dry-run)	11s
PR checks	4s
	9m 17s