ci: Upload ida-plugin.json as separate release asset

Makes metadata file visible on release page for easier discovery

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

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

Author: 0xeb

.github/workflows/build.yml

@@ -150,3 +150,4 @@ jobs:
             release/qscripts.dll
             release/qscripts.so
             release/qscripts.dylib
+            release/ida-plugin.json