chore: add issue and PR templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report to help us improve
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. Run command '...'
+        2. See error
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened.
+    validations:
+      required: true
+  - type: input
+    id: environment
+    attributes:
+      label: Environment
+      description: OS, Python version, modelinfo-cli version
+      placeholder: e.g. Ubuntu 22.04, Python 3.10.12, v1.4.1
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Additional Context or Logs
+      description: Add any other context about the problem here, or paste relevant tracebacks.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for this project
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Description
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+## Summary
+
+Provide a brief summary of what this PR accomplishes.
+
+## Motivation & Context
+
+Why is this change required? What problem does it solve?
+If it fixes an open issue, please link to the issue here.
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Refactoring (no functional changes, no api changes)
+- [ ] Documentation update
+
+## How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes.
+Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.
+
+- [ ] Unit tests
+- [ ] Integration tests
+- [ ] Manual testing
+
+## Screenshots (if appropriate)
+
+## Checklist
+
+- [ ] My code follows the code style of this project.
+- [ ] My commit messages follow the Conventional Commits format, are lowercase, imperative, and specific.
+- [ ] My commit includes a "How to test" section in the body.
+- [ ] I have updated the documentation accordingly (if applicable).
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.