Added PR templates for Backend, Frontend, and Documentation

.github/PULL_REQUEST_TEMPLATE/backend.md

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+### Backend Update - Pull Request Template
+
+#### Description
+- **Briefly describe the purpose of this PR.** Include context about the AI model, web scraping, API, or other backend components that have been added or modified.
+
+#### Key Changes
+- **Core Changes:** Summarize the main changes introduced in this PR (e.g., "Added new AI model for XYZ," "Improved scraper efficiency," or "Refactored API calls").
+- **Functionality Details:** Provide any specifics about the approach taken and its intended impact on backend performance or functionality.
+
+#### Testing
+- **Steps for Testing:** Outline steps to reproduce and verify the change locally or in a test environment.
+- **Automated Tests:** If applicable, list any automated tests included or updated in this PR.
+
+#### Related Issues or Tasks
+- Closes #<issue_number> (Reference relevant issue/task in the project)
+
+#### Checklist
+- [ ] Code follows company code style and guidelines
+- [ ] Added necessary comments and docstrings where applicable
+- [ ] Added or updated tests
+- [ ] This PR is ready for code review and testing
+
+#### Additional Notes
+- Include any remaining questions, planned refactoring, or future improvements here.
+