Add GitHub Copilot instructions for workshop app onboarding

[Copilot]

This PR adds comprehensive GitHub Copilot instructions to help onboard developers and improve code suggestions for the Workshop App monorepo.

What's Added

A new .github/copilot-instructions.md file that provides GitHub Copilot with detailed context about:

• Repository structure - Overview of the monorepo layout with frontend, backend, and shared components
• Technology stack - Node.js/Express backend with SQLite, vanilla JavaScript frontend
• Architecture patterns - JWT authentication, role-based access control, RESTful API design
• Code patterns - Examples for consistent API routes, error handling, and frontend utilities
• Security guidelines - Best practices for input validation, SQL injection prevention, and XSS protection
• Development workflow - Guidelines for adding features, database changes, and maintaining code style

Why This Helps

With these instructions, GitHub Copilot will:

• Suggest code that follows the existing patterns and conventions
• Understand the role-based authentication system (admin, user, tech)
• Generate API routes with proper security middleware
• Suggest frontend code that uses the existing utility functions
• Maintain consistency with the vanilla JavaScript and modular architecture
• Follow the established security practices and error handling patterns

Example Benefits

When a developer starts typing:

router.get('/admin/users', 

Copilot will now suggest adding authentication and role checking:

router.get('/admin/users', authenticateToken, requireRole('admin'), (req, res) => {
  // Handler implementation
});

This onboarding documentation ensures new contributors and AI assistance align with the project's architecture and best practices from day one.

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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.

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[SmokeHound]

github_copilot-instructions.md
@copilot

[Copilot]

github_copilot-instructions.md
@copilot

I can see you've attached a github_copilot-instructions.md file. Could you clarify what you'd like me to do with it? Should I:

1. Replace the current .github/copilot-instructions.md file with the content from your attachment?
2. Merge specific sections from your file into the existing one?
3. Compare and update based on differences?

I can't directly access the attachment, so if you could share the content or specific changes you'd like me to make, I'll be happy to update the file accordingly.

[coderabbitai]

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[Copilot]

Pull Request Overview

This PR adds comprehensive GitHub Copilot instructions to help onboard developers and improve AI-generated code suggestions for a workshop management monorepo. The instructions provide detailed context about the repository structure, technology stack, and coding patterns to ensure consistent code generation.

Key changes:

• Creates a new GitHub Copilot instructions file with detailed repository documentation
• Documents architecture patterns including JWT authentication, role-based access control, and RESTful API design
• Provides code examples and security guidelines for both frontend and backend development

[Copilot]

[nitpick] The term 'manual schema management' could be clearer. Consider specifying what this means (e.g., 'SQLite database with schema managed through direct SQL scripts' or 'SQLite database without automated migrations').

[Copilot]

[nitpick] The reference to .env-example assumes this file exists in the repository. Since this is documentation for Copilot instructions, it would be helpful to clarify the actual location of environment variable examples or remove the reference if the file doesn't exist.

[SmokeHound]

https://github.com/SmokeHound/workshop-app/blob/main/.env-example
@copilot