Sync layouts, typography, and watermark studio for self-hosted OSS.

Unlock features without credits/Stripe, point docs to docs.songs2vid.com, and drop leftover billing admin surfaces.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/api-auth.ts

@@ -33,7 +33,7 @@ export async function requirePaidApiUser(req: NextRequest) {
   if (!hasProFeatures(user.plan)) {
     return {
       error: NextResponse.json(
-        { error: "API access requires an active Pro subscription" },
+        { error: "API access is unavailable for this account" },
         { status: 403 },
       ),
       user: null,
@@ -87,7 +87,7 @@ export async function requirePaidUserFromSessionOrApi(req: NextRequest) {
   if (!hasProFeatures(sessionUser.plan)) {
     return {
       error: NextResponse.json(
-        { error: "API access requires an active Pro subscription" },
+        { error: "API access is unavailable for this account" },
         { status: 403 },
       ),
       user: null,