docs: add GitHub issue templates (bug report + feature request)

Adds a config.yml chooser and two markdown templates:
- bug_report.md — structured bug report with reproduction steps,
  environment info, and screenshot slot
- feature_request.md — enhancement/UX/refactor request with
  problem statement, proposed solution, and alternatives

Both follow the project's bracket-prefix title convention.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,42 @@
+---
+name: 🐛 Bug report
+description: Report a bug or unexpected behaviour
+title: '[bug] '
+labels: bug
+assignees: ''
+---
+
+## Describe the bug
+
+<!-- A clear and concise description of what the bug is. -->
+
+## To reproduce
+
+Steps to reproduce the behaviour:
+
+1. Go to '…'
+2. Tap on '…'
+3. Scroll to '…'
+4. See error
+
+## Expected behaviour
+
+<!-- What should have happened instead? -->
+
+## Screenshots / screen recordings
+
+<!-- If applicable, add screenshots or a screen recording to help explain the problem. -->
+
+## Environment
+
+- Device: <!-- e.g. Pixel 8, Samsung Galaxy S24 -->
+- Android version: <!-- e.g. Android 14, Android 15 -->
+- App version: <!-- e.g. v1.2.3, or the commit SHA -->
+- Hermes dashboard version: <!-- if known -->
+
+## Additional context
+
+<!--
+  Anything else? Error logs, crash reports (adb logcat), network trace, etc.
+  Remove any sensitive info (tokens, hostnames) before pasting.
+-->