Add issue templates for bug reports, feature requests, and questions

Adds Gitea issue templates in .gitea/ISSUE_TEMPLATE/:
- bug_report.md: Environment, steps to reproduce, error output
- feature_request.md: Use case, proposed solution, alternatives
- question.md: Context, what's been tried

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

.gitea/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,21 @@
+---
+name: Feature Request
+about: Suggest a new feature or improvement
+labels: enhancement
+---
+
+## Feature Description
+
+A clear description of the feature you'd like to see.
+
+## Use Case
+
+Why do you need this? What problem does it solve?
+
+## Proposed Solution
+
+How do you think it should work? (optional)
+
+## Alternatives Considered
+
+Any other approaches you've thought about? (optional)