chore: add GitHub issue templates for bug reports and feature requests

Adopts issue template pattern from opencode-antigravity-auth:
- Bug report template with [BUG] prefix and 6-item checklist
- Feature request template with [FEATURE] prefix
- Config disables blank issues, adds links to Google Cloud Support, TOS, and Discussions

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

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,28 @@
+---
+name: Feature Request
+about: Suggest a new feature or enhancement
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+---
+
+**Feature Description**
+A clear description of the feature you'd like to see.
+
+**Use Case**
+Explain how this feature would be used and what problem it solves.
+
+**Proposed Implementation**
+If you have ideas about how this could be implemented, share them here.
+
+**Compliance Consideration**
+Please confirm:
+- [ ] This feature is for personal development use
+- [ ] This feature does not violate or circumvent Google's Terms of Service
+- [ ] This feature is not intended for commercial resale or multi-user access
+
+**Alternatives Considered**
+Have you considered any alternative solutions or workarounds?
+
+**Additional Context**
+Add any other context, screenshots, or examples.