docs: prepare repository for open-source collaboration

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a reproducible issue
+title: "[Bug]: "
+labels: bug
+assignees: ''
+---
+
+## Description
+
+Describe the problem clearly.
+
+## Reproduction Steps
+
+1.
+2.
+3.
+
+## Expected Behavior
+
+What did you expect to happen?
+
+## Actual Behavior
+
+What happened instead?
+
+## Environment
+
+- Platform: <!-- ios / android / web -->
+- OS / Device:
+- App version / commit:
+- Node version:
+
+## Additional Context
+
+Logs, screenshots, or videos.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an improvement
+title: "[Feature]: "
+labels: enhancement
+assignees: ''
+---
+
+## Problem Statement
+
+What problem are you trying to solve?
+
+## Proposed Solution
+
+Describe the desired behavior and UX.
+
+## Alternatives Considered
+
+What alternatives did you evaluate?
+
+## Additional Context
+
+Any references, mockups, or constraints.