Add bambu-nfc dump parse, Key-A HKDF, and spool merge.

Parse filanfc-dump/v1 zip/JSON, Bambu 1K images, and merge stickers by tray UID. dump and mifare packages stay importable for a later common library.

errors.go

@@ -0,0 +1,12 @@
+package bambunfc
+
+import "errors"
+
+var (
+	ErrInvalidDump = errors.New("invalid dump")
+	ErrImageSize   = errors.New("image size")
+	ErrIncomplete  = errors.New("incomplete tag")
+	ErrNotBambu    = errors.New("not bambu")
+	ErrUID         = errors.New("uid")
+	ErrConflict    = errors.New("tag conflict")
+)