Add GitHub community health files and issue templates

[Copilot]

Implements complete GitHub spec kit to enable structured community engagement and achieve 100% community standards compliance.

Issue Templates

Modern YAML templates with structured data collection:

• bug_report.yml - Browser/device detection, required fields, screenshot uploads
• feature_request.yml - Category-based triage (UI, PWA, Data Management, etc.)
• question.yml - Pre-submission checklist to reduce duplicate issues
• config.yml - Disables blank issues, routes to Discussions

Pull Request Template

Comprehensive checklist including PWA-specific testing (offline mode, service worker, mobile devices).

Community Documentation

• CONTRIBUTING.md - Development setup, PR process, TypeScript/React conventions, PWA testing guidelines
• CODE_OF_CONDUCT.md - Contributor Covenant v2.1
• SECURITY.md - Vulnerability disclosure process, data privacy considerations for localStorage/PWA
• SUPPORT.md - FAQ covering installation, data export/import, offline functionality, troubleshooting
• LICENSE - MIT (matches package.json)

README Enhancements

Added status badges and organized documentation links for quick navigation to community resources.

Total: 1,222 lines across 11 files

Original prompt

GitHub spec kit

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.