feat: add GitHub issue and PR templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug or unexpected behavior
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug! Please fill out the form below.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is.
+      placeholder: Describe the bug...
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. Initialize client with '...'
+        2. Call method '...'
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: code
+    attributes:
+      label: Minimal Reproducible Example
+      description: If applicable, provide a minimal code example that reproduces the issue.
+      render: python
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Error Logs
+      description: If applicable, paste any error messages or stack traces.
+      render: shell
+
+  - type: input
+    id: version
+    attributes:
+      label: OpenViking Version
+      description: What version of OpenViking are you using?
+      placeholder: e.g., 0.1.0
+    validations:
+      required: true
+
+  - type: input
+    id: python-version
+    attributes:
+      label: Python Version
+      description: What version of Python are you using?
+      placeholder: e.g., 3.10.0
+    validations:
+      required: true
+
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      options:
+        - Linux
+        - macOS
+        - Windows
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: backend
+    attributes:
+      label: Model Backend
+      description: Which model backend are you using?
+      options:
+        - Volcengine (Doubao)
+        - OpenAI
+        - Other
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Documentation
+    url: https://www.openviking.ai/docs
+    about: Check the documentation for guides and API reference
+  - name: Discord Community
+    url: https://discord.com/invite/eHvx8E9XF3
+    about: Join our Discord server for discussions and support
+  - name: Questions & Discussions
+    url: https://github.com/volcengine/OpenViking/discussions
+    about: Ask questions and share ideas in GitHub Discussions

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a feature! Please fill out the form below.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: A clear description of what the problem is. Ex. I'm always frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like.
+      placeholder: A clear description of what you want to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Describe any alternative solutions or features you've considered.
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Feature Area
+      description: Which area of OpenViking does this feature relate to?
+      options:
+        - Core (Client/Engine)
+        - Filesystem Operations
+        - Retrieval/Search
+        - Session Management
+        - Model Integration
+        - Storage/VectorDB
+        - CLI Tools
+        - Documentation
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+      description: Describe the use case for this feature.
+      placeholder: How would you use this feature in your project?
+    validations:
+      required: true
+
+  - type: textarea
+    id: code-example
+    attributes:
+      label: Example API (Optional)
+      description: If applicable, provide an example of how the API might look.
+      render: python
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context, screenshots, or references about the feature request.
+
+  - type: checkboxes
+    id: contribution
+    attributes:
+      label: Contribution
+      options:
+        - label: I am willing to contribute to implementing this feature

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask a question about OpenViking usage
+title: "[Question]: "
+labels: ["question"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Have a question about OpenViking? We're here to help!
+
+  - type: textarea
+    id: question
+    attributes:
+      label: Your Question
+      description: What would you like to know?
+      placeholder: Describe your question clearly...
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: Provide any relevant context or background.
+      placeholder: |
+        - What are you trying to achieve?
+        - What have you tried so far?
+
+  - type: textarea
+    id: code
+    attributes:
+      label: Code Example (Optional)
+      description: If applicable, share relevant code.
+      render: python
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Related Area
+      options:
+        - Installation / Setup
+        - Configuration
+        - API Usage
+        - Retrieval / Search
+        - Session Management
+        - Performance
+        - Other
+
+  - type: checkboxes
+    id: checked-docs
+    attributes:
+      label: Before Asking
+      options:
+        - label: I have checked the [documentation](https://www.openviking.ai/docs)
+          required: true

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Provide a brief description of the changes in this PR -->
+
+## Related Issue
+
+<!-- Link to the related issue (if applicable) -->
+<!-- Fixes #(issue number) -->
+
+## Type of Change
+
+<!-- Mark the relevant option with an "x" -->
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Refactoring (no functional changes)
+- [ ] Performance improvement
+- [ ] Test update
+
+## Changes Made
+
+<!-- List the main changes made in this PR -->
+
+-
+-
+-
+
+## Testing
+
+<!-- Describe how you tested your changes -->
+
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] I have tested this on the following platforms:
+  - [ ] Linux
+  - [ ] macOS
+  - [ ] Windows
+
+## Checklist
+
+- [ ] My code follows the project's coding style
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] Any dependent changes have been merged and published
+
+## Screenshots (if applicable)
+
+<!-- Add screenshots to help explain your changes -->
+
+## Additional Notes
+
+<!-- Add any additional notes or context about the PR -->