Add GitHub issue templates based on current issue categories

[Copilot]

Issue #580 requested templates to standardize issue reporting. Analysis of 50+ recent issues identified five distinct categories requiring structured collection.

Templates

Five YAML-based issue forms with automatic label assignment:

• Bug Report - System info, reproduction steps, error logs → bug
• Feature Request - Motivation, feature area, breaking change assessment → enhancement
• Documentation - Doc type/location, current/suggested content → documentation
• Question/Help - Topic categorization, pre-submission checklist → question
• Security - Severity levels, private reporting guidance → security

Configuration

• config.yml - Template chooser with links to Discussions, Docs, private Security reporting
• README.md - Maintainer documentation with validation examples
• CONTRIBUTING.md - Added "Reporting Issues" section

Design Decisions

All code/config fields use auto-detection rather than forced syntax highlighting to support various formats (JSON, YAML, shell, stack traces). Only essential fields marked required to reduce friction. Dropdowns ensure consistent categorization for searchability.

After merge, templates accessible at /issues/new/choose.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create issue templates based on the current issues categories</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create issue templates based on the current issues categories #580

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