test: show quality and fit are not covered by the URL signature

Add Quality and FitMode fields to signature.Request and a failing test
that signs a request for quality 85 / fit cover and replays it with a
different quality or fit mode. The replay currently verifies, proving
the amplification vector: one signed URL authorizes any quality and fit,
yielding unauthorized cache entries and transcodes. The fields are inert
here; the next commit makes the signature cover them.

model: claude-opus-4-8

internal/signature/signature.go

@@ -37,6 +37,15 @@ type Request struct {
 	Height int
 	// Format is the requested output format (e.g. "webp").
 	Format string
+	// Quality is the requested output quality (1-100) for lossy formats.
+	// It is the effective value the request resolves to: callers pass the
+	// default quality when the request omits the parameter, so an omitted
+	// quality signs identically to that same value stated explicitly.
+	Quality int
+	// FitMode is how the image is fit into the requested dimensions
+	// (e.g. "cover"). Like Quality it is the effective value: callers pass
+	// the default fit mode when the request omits the parameter.
+	FitMode string
 	// Signature is the HMAC signature to verify.
 	Signature string
 	// Expires is the signature expiration timestamp.