Added PR templates for Backend, Frontend, and Documentation

.github/PULL_REQUEST_TEMPLATE/frontend.md

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+### Frontend Update - Pull Request Template
+
+#### Description
+- **Describe the purpose of this frontend change**: Briefly explain what UI components, visualizations, or frontend elements are introduced or updated.
+
+#### Key Changes
+- **Summary of Changes:** Provide a brief list of the UI elements modified or added (e.g., new visualization charts, dashboards, etc.).
+- **User Impact:** Describe how the changes will impact user interactions or the visual presentation of AI results.
+
+#### Screenshots (if applicable)
+- **Before:** Insert image here
+- **After:** Insert image here
+
+#### Testing
+- **Testing Steps:** Provide steps to test the UI changes locally or on staging (e.g., “Navigate to XYZ page to see changes”).
+- **Compatibility Checks:** Ensure that the changes display properly across major browsers/devices.
+
+#### Related Issues or Tasks
+- Closes #<issue_number> (Reference any frontend-specific issues or tasks)
+
+#### Checklist
+- [ ] Code meets frontend design and UX standards
+- [ ] Documentation added or updated
+- [ ] Visual tests passed across supported browsers
+- [ ] This PR is ready for code review and UX testing
+
+#### Additional Notes
+- Mention future improvements or refactoring needs here, if any.
+