chore(github): enable blank issues (#699)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: huyenltnguyen <25715018+huyenltnguyen@users.noreply.github.com>

Author: Copilot

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: true