Add issue and PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug or unexpected behavior
+title: '[BUG] '
+labels: bug
+assignees: ''
+---
+
+## Description
+A clear description of the bug.
+
+## Steps to Reproduce
+1.
+2.
+3.
+
+## Expected Behavior
+What you expected to happen.
+
+## Actual Behavior
+What actually happened.
+
+## Environment
+- OS:
+- Python version:
+- Claude API version:
+
+## Logs
+```
+Paste relevant logs here
+```
+
+## Additional Context
+Any other context about the problem.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature or enhancement
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+---
+
+## Problem
+What problem does this solve?
+
+## Proposed Solution
+How should it work?
+
+## Alternatives Considered
+Any alternative solutions you've considered.
+
+## Additional Context
+Any other context, mockups, or examples.

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+Brief description of changes.
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation
+- [ ] Refactoring
+- [ ] Other (describe):
+
+## Changes Made
+-
+-
+
+## Testing
+How were these changes tested?
+
+## Checklist
+- [ ] Code follows project style
+- [ ] Self-reviewed the code
+- [ ] Added/updated documentation if needed
+- [ ] No breaking changes (or documented)
+
+## Related Issues
+Closes #