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Addresses J's Request Changes review on PR #3903. Problem: PR #3903 wrapped /uploads/* in middleware.Auth, but native <img>/<video>/<iframe> resource loads cannot attach Authorization headers. Token-auth clients (Desktop default, legacy-token Web sessions, mobile) were breaking on inline attachment rendering even though the API itself authenticated fine. Fix: implement HMAC-signed query parameters for /uploads/*, mirroring S3 + CloudFront presigned URLs. - storage.SignLocalUploadURL(rawURL, key, secret, expiry) appends '?exp=<unix>&sig=<HMAC-SHA256(key|exp)>' query params; signature is bound to one specific key, has a TTL matching CloudFront mode (defaultAttachmentDownloadURLTTL = 30 min), constant-time compared on verify. - storage.VerifyLocalUploadSignature(key, exp, sig, secret, now) rejects expired, tampered, wrong-secret, and key-mismatched signatures. - ServeLocalUpload now has two auth paths: signed-query (no Auth middleware needed; signature itself is the authority) and Bearer/cookie (membership-gated as before). Partial signed-query fails closed. - The route in router.go dispatches between the two: if both exp+sig query params are present, route to inner handler unwrapped; else wrap in middleware.Auth. - attachmentToResponse appends signed query to URL when the storage backend is *LocalStorage. CloudFront-signed download URLs and S3 paths are unchanged. Tests: - storage: TestSignAndVerifyLocalUploadURL_RoundTrip, TestVerifyLocalUploadSignature_RejectsExpired, _RejectsTamperedSig, _BoundToKey, _RejectsWrongSecret, TestSignLocalUploadURL_PreservesExistingQuery, TestLocalUploadSignatureFromQuery_EmptyOnAbsence (7 pure tests). - handler: TestServeLocalUpload_{SignedQueryBypassesAuth, SignedQueryRejectsExpired, SignedQueryRejectsTampered, SignedQueryBoundToOneKey, PartialSignedQueryFailsClosed}, TestAttachmentToResponse_LocalStorageMintsSignedURL. Full server test suite passes. Co-authored-by: multica-agent <github@multica.ai>