fix: upload limit 500MB, mount all public dirs in docker

src/app/api/assets/route.ts

@@ -176,8 +176,8 @@ export async function POST(request: NextRequest) {
     if (!ALL_EXTENSIONS.includes(ext)) {
       return NextResponse.json({ error: `Type "${ext}" not allowed. Accepted: ${ALL_EXTENSIONS.join(", ")}` }, { status: 400 });
     }
-    if (file.size > 50 * 1024 * 1024) {
-      return NextResponse.json({ error: "File exceeds 50MB limit" }, { status: 400 });
+    if (file.size > 500 * 1024 * 1024) {
+      return NextResponse.json({ error: "File exceeds 500MB limit" }, { status: 400 });
     }
 
     const dirPath = buildSafePath(scope, slug, subPath);