fix: copyJobId should check asset.id for OSS compatibility

In OSS environments, asset.id is the promptId directly.
In Cloud environments, promptId is in user_metadata.
Updated copyJobId to check both sources (same as deletion logic).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: viva-jinyi

src/platform/assets/composables/useMediaAssetActions.ts

@@ -183,9 +183,9 @@ export function useMediaAssetActions() {
     const asset = mediaContext?.asset.value
     if (!asset) return
 
-    // Get promptId from metadata instead of parsing the ID string
+    // Try asset.id first (OSS), then fall back to metadata (Cloud)
     const metadata = getOutputAssetMetadata(asset.user_metadata)
-    const promptId = metadata?.promptId
+    const promptId = asset.id || metadata?.promptId
 
     if (!promptId) {
       toast.add({