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POST /api/admin/upload-video: mp4 magic-byte sniff (checks the ftyp box, not offset-0 like images), 50MB cap, no re-encode needed (unlike images, no EXIF/GPS concern for video). Reuses the multipart parser and uploads/ layout from T2's image path via a shared placeInUploads helper.
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Single shared password (.env ADMIN_PASSWORD) + in-memory HttpOnly session cookie, no accounts/roles — MVCP M.1/M.10's real account system supersedes this in period 3. Covers the existing /api/admin/library/* routes (previously unauthenticated, see architecture.md 1.2's tech-debt note) plus the new upload endpoint. admin.html gets a fetch() interceptor that redirects to the new admin-login.html on any 401 from /api/admin/*, rather than patching every call site.
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POST /api/admin/upload: hand-rolled multipart parser (no deps installed in this project), real magic-byte sniffing (rejects extension-spoofed files), 8MB cap, and EXIF/GPS stripping via a sips bmp round-trip (macOS-native, no dependency — sips's direct jpeg->jpeg re-encode alone does NOT strip EXIF, only the bmp intermediate does). GET /uploads/* serves the result with a path-traversal guard. forwardToH3Assets() is the T7/T8 hook for pushing a saved upload to H3 Console's own POST /v1/assets (found in the S1-S4 spike) — not covered by the automated suite since it needs a live network call, same treatment as the spike scripts.
