feat(storage): serve media through backend and add local FS backend

- introduce storage.Backend with S3 and local file-system implementations
- deliver all blobs via signed GET/HEAD /api/objects/<key> (Range, Content-Type)
- stream S3 objects through the backend; remove presigned URL path
- share shared HMAC Signer between backends
- remove S3_PUBLIC_URL; rename S3_PRESIGN_TTL to OBJECT_URL_TTL
- make storage label in health dynamic; nginx proxy_buffering off for objects

This commit is contained in:

2026-10-11 09:15:03 +03:00

parent 7ae9bcf305

commit ec8d907565

28 changed files with 1714 additions and 65 deletions

									
										openspec/changes/local-fs-storage-backend/.openspec.yaml
									
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				schema: spec-driven

				created: 2026-10-11