feat(random): send /gachabeta clips as 360x640 portrait animations

Each gacha style now carries the frame size it renders, so Telegram receives the beta wish's portrait size while /gacha stays 640x360.

docs/deploy-coolify-selfhosted.md

@@ -94,8 +94,8 @@ animation and reply show. Options are 5★ by default; prefix `4*` or `3*` to
 lower one, e.g. `/gacha Pizza, 4* Pho, 3* Rice`.
 
 The unlisted `/gachabeta` takes the same input and renders the beta version
-of the wish from `.../api/gachabeta` on the same service, with the same text
-fallback.
+of the wish from `.../api/gachabeta` on the same service as a `360x640`
+portrait MP4, with the same text fallback.
 
 ## 1. MongoDB Atlas (M0)
 

internal/modules/random/gacha_api_client.go

@@ -16,15 +16,19 @@ const (
 )
 
 // gachaStyle is one wish animation the renderer serves: its path next to
-// /api/gif and the clip length in seconds.
+// /api/gif, the clip length in seconds, and the frame size it renders for a
+// gachaRemoteWidth request.
 type gachaStyle struct {
 	Path     string
 	Duration int
+	Width    int
+	Height   int
 }
 
 var (
-	gachaStyleWish = gachaStyle{Path: "gacha", Duration: 7}
-	gachaStyleBeta = gachaStyle{Path: "gachabeta", Duration: 6}
+	gachaStyleWish = gachaStyle{Path: "gacha", Duration: 7, Width: gachaRemoteWidth, Height: gachaRemoteHeight}
+	// The beta wish is portrait: the requested width is its long edge.
+	gachaStyleBeta = gachaStyle{Path: "gachabeta", Duration: 6, Width: gachaRemoteHeight, Height: gachaRemoteWidth}
 )
 
 type gachaAPIRequest struct {
@@ -87,7 +91,7 @@ func renderGachaAnimation(ctx context.Context, style gachaStyle, label string, r
 	return wheelAnimation{
 		Data:     data,
 		Duration: style.Duration,
-		Width:    gachaRemoteWidth,
-		Height:   gachaRemoteHeight,
+		Width:    style.Width,
+		Height:   style.Height,
 	}, nil
 }

internal/modules/random/gacha_command_test.go

@@ -208,8 +208,10 @@ func TestGachaBeta_UsesBetaRendererAndAnyoneCanRunIt(t *testing.T) {
 	if animation == nil {
 		t.Fatalf("calls = %+v, want a sendAnimation", rb.Sent())
 	}
-	if got := animation.Form["duration"]; got != "6" {
-		t.Fatalf("duration = %q, want 6", got)
+	for field, want := range map[string]string{"duration": "6", "width": "360", "height": "640"} {
+		if got := animation.Form[field]; got != want {
+			t.Fatalf("%s = %q, want %s", field, got, want)
+		}
 	}
 }