ci: add pull request template

PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Pull request
+
+Please ensure this PR targets the **`dev` branch** and follows the project conventions.  
+CI already runs linting, formatting, and build checks automatically.
+
+---
+
+### Before submitting
+
+- [ ] This PR targets the `dev` branch (not `main`)
+- [ ] Commit messages follow the semantic-release format
+- [ ] No debug logs or sensitive data included
+
+---
+
+### Summary
+Short description of what this PR changes or adds.
+
+---
+
+### Type of change
+- [ ] Feature  
+- [ ] Fix  
+- [ ] Refactor  
+- [ ] Internal / CI  
+- [ ] Documentation  
+
+---
+
+### Scope
+- [ ] Android  
+- [ ] iOS  
+- [ ] Core  
+- [ ] Example App  
+- [ ] Docs  
+
+---
+
+### Related
+List any related issues, pull requests, or discussions.  
+Use the format:  
+`Fixes #123`, `Refs #456`, `Close #789`
+
+---
+
+### Additional notes
+_(Optional – anything relevant for the reviewer)_