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/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 💬 Discussion
+    url: https://github.com/Hy4ri/hermes-mobile/discussions
+    about: For questions, ideas, or general discussion