docs: Add standardized Pull Request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Briefly describe what changed and why. -->
+
+## Related Issue
+
+<!-- Link the related issue, if applicable. Example: Closes #123 -->
+
+Closes #
+
+## Type of Change
+
+<!-- Select all that apply. -->
+
+* [ ] Bug fix
+* [ ] New feature
+* [ ] UI/UX improvement
+* [ ] Refactor / performance improvement
+* [ ] Documentation
+* [ ] Build / CI / tooling
+
+## Key Changes
+
+<!-- Summarize the main implementation changes. -->
+
+*
+
+## Testing
+
+<!-- Select the checks that apply and briefly mention any additional verification performed. -->
+
+* [ ] Android TV / Fire TV (D-pad / remote navigation)
+* [ ] Mobile / Tablet (touch UI)
+* [ ] iOS
+* [ ] `./gradlew assembleSideloadDebug` completed successfully
+* [ ] Manual testing performed on a target device or emulator
+* [ ] Not applicable
+
+<!-- Add any relevant testing details, devices, or configurations here. -->
+
+## Screenshots / Demo
+
+<!-- For UI/UX changes, add before/after screenshots or a short recording. Remove this section if not applicable. -->
+
+|        Before        |         After        |
+| :------------------: | :------------------: |
+| <!-- Image / GIF --> | <!-- Image / GIF --> |
+
+## Checklist
+
+* [ ] My changes follow the repository's existing code style and conventions.
+* [ ] I have reviewed my own changes.
+* [ ] My changes do not include credentials, private keys, or prohibited third-party media links as defined by the `README.md` Content Policy.
+* [ ] I have updated relevant documentation where needed.
+* [ ] I have kept this PR focused and avoided unrelated changes.