feat: initialize project template structure

- Add README with agent workflow guidance
- Create agent role instructions (HA_Coder)
- Add Issue and Pull Request templates
- Establish standard folder structure

.gitea/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature Request
+about: Suggest a new feature for this project
+title: '[FEATURE] '
+labels: feature
+---
+
+## Description
+
+## Motivation
+
+## Proposed Solution
+
+## Acceptance Criteria
+
+- [ ] 
+- [ ] 
+- [ ] 
+
+## Related Planning
+
+Reference any related issues or plans from the `core-planning` repository.

.gitea/pull_request_template.md

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+## Summary
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Refactoring
+- [ ] Documentation
+- [ ] Other: 
+
+## Related Task / Issue
+
+Reference the task from `/tasks` or a planning issue from `core-planning`.
+
+## Testing
+
+- [ ] Unit tests added/updated
+- [ ] Manual testing completed
+- [ ] All existing tests pass
+
+## Checklist
+- [ ] Code follows project style guidelines
+- [ ] Self-review completed
+- [ ] Documentation updated (if needed)