Add GitHub Copilot instructions file with comprehensive development guidelines

.github/copilot-instructions.md

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+# Open Source Bazaar - GitHub Copilot Instructions
+
+Open Source Bazaar is an open-source project showcase platform built with Next.js 15, TypeScript, React Bootstrap, and MobX. It includes license filters, Wiki knowledge base, volunteer showcase, Lark integration, and other features.
+
+Always reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.
+
+## Critical Requirements
+
+⚠️ **MANDATORY NODE.JS VERSION**: This project requires **Node.js >=20**. The build works on Node.js 20+ but may have warnings.
+
+- Check Node.js version: `node --version`
+- Development and linting commands work on Node.js 20+
+- Use **PNPM** as package manager, not NPM or Yarn
+
+## Working Effectively
+
+### Initial Setup (REQUIRED for all development)
+
+1. **Install global pnpm**: `npm install -g pnpm`
+2. **Install dependencies**: `pnpm install` -- takes 1-3 minutes. NEVER CANCEL. Set timeout to 5+ minutes.
+3. **Verify setup**: `pnpm --version` (should be 10.x+)
+
+**Important**: If you see "node_modules missing" error, you MUST run `pnpm install` first before any other commands.
+
+### Development Workflow (FULLY VALIDATED)
+
+- **Start development server**: `pnpm dev` -- starts in 5-15 seconds on http://localhost:3000
+- **Run linting**: `pnpm lint` -- takes 15 seconds. NEVER CANCEL. Set timeout to 2+ minutes.
+- **Run tests**: `pnpm test` -- runs lint-staged + lint, takes 15 seconds. Set timeout to 2+ minutes.
+
+### Build Process
+
+- **Production build**: `pnpm build` -- works on Node.js 20+ (estimated 30s-2 minutes)
+  - NEVER CANCEL. Set timeout to 5+ minutes.
+- **Static export**: Available but not commonly used in development
+
+## Validation Scenarios
+
+After making ANY changes, ALWAYS validate by running through these scenarios:
+
+### Manual Testing Requirements
+
+1. **Start development server**: `pnpm dev` and verify it starts without errors
+2. **Navigate to homepage**: Visit http://localhost:3000 and verify page loads with navigation menu
+3. **Test core pages**:
+   - License filter: http://localhost:3000/license-filter (interactive license selection tool)
+   - Wiki pages: http://localhost:3000/wiki (policy documents from GitHub)
+   - Volunteer page: http://localhost:3000/volunteer (contributor showcase)
+   - Projects: http://localhost:3000/project (GitHub repository listings)
+4. **Test API endpoints**: Verify GitHub API integrations work
+5. **Check responsive design**: Test mobile/desktop layouts with React Bootstrap components
+6. **Verify i18n functionality**: Check Chinese/English language switching works
+
+### Pre-commit Validation
+
+ALWAYS run before committing changes:
+
+```bash
+npm test     # Runs linting + staged file checks
+```
+
+## Key Project Structure
+
+### Important Directories
+
+- `pages/` - Next.js pages and API routes
+- `components/` - Reusable React components with Bootstrap styling
+- `models/` - MobX stores and data models
+- `translation/` - i18n language files (zh-CN, en-US, zh-TW)
+- `styles/` - CSS and styling files
+- `public/` - Static assets
+
+### Configuration Files
+
+- `package.json` - Dependencies and scripts
+- `next.config.ts` - Next.js configuration with MDX support
+- `tsconfig.json` - TypeScript configuration
+- `eslint.config.ts` - ESLint configuration
+- `babel.config.js` - Babel configuration
+
+### Key Dependencies
+
+- **Next.js 15** - React framework
+- **React Bootstrap 2.10** - UI component library
+- **MobX 6.13** - State management
+- **MobX-GitHub 0.4** - GitHub API integration
+- **MobX-i18n 0.7** - Internationalization
+- **License-Filter 0.2** - License filtering functionality
+- **Marked 16.2** - Markdown processing
+
+## Development Standards and Best Practices
+
+Based on comprehensive PR review analysis, follow these critical development standards:
+
+### Architecture and Code Organization
+
+#### Component and Import Standards
+
+- **ALWAYS use React Bootstrap components** instead of custom HTML elements
+- Use utilities from established libraries: 'web-utility'
+- Import `'./Base'` in model files for proper configuration
+
+#### Error Handling and Static Generation
+
+- **Natural error throwing** for static generation - let errors bubble up to catch build issues
+- Ensure build passes before pushing - resolve issues at compile time
+
+### UI/UX Standards
+
+#### Component Usage Patterns
+
+```typescript
+// ✅ Correct - use React Bootstrap components
+import { Button, Badge, Breadcrumb, Card, Container } from 'react-bootstrap';
+
+<Button variant="outline-primary" size="sm" href={url} target="_blank">
+  {t('edit_on_github')}
+</Button>
+
+<Badge bg="secondary">{label}</Badge>
+
+// ❌ Wrong - custom HTML elements
+<a href={url} className="btn btn-outline-primary">Edit</a>
+<span className="badge bg-secondary">{label}</span>
+```
+
+#### Semantic HTML Structure
+
+- Use ordered lists (`<ol>`) for countable items, unordered lists (`<ul>`) for navigation
+- Apply proper semantic structure: `<article>`, `<header>`, `<section>`
+- Use `list-unstyled` class for first-level lists to remove default styling
+
+### Code Quality Standards
+
+#### Modern ECMAScript Features
+
+- Use optional chaining and modern JavaScript features
+- Let TypeScript infer types when possible to avoid verbose annotations
+- Use modern ECMAScript patterns for cleaner, more maintainable code
+
+#### Import and Type Management
+
+- Import from established sources: ContentModel from mobx-github, utilities from web-utility
+- Import configuration files where needed: `'./Base'` for GitHub client setup
+- Use minimal exports and avoid unnecessary custom implementations
+- Use configured clients rather than creating new ones
+
+### Translation and Internationalization
+
+#### Critical Translation Requirements
+
+- **ALL user-facing text** MUST be translated using i18n system
+- This includes button text, labels, error messages, placeholder text, and dynamic content
+- Use the `t()` function from I18nContext for all translations
+
+#### Translation Patterns
+
+- Use the `t()` function from I18nContext for all user-facing text
+- Translate all button text, labels, error messages, and dynamic content
+- Avoid hardcoded text in any language
+
+#### Translation Key Management
+
+- Use generic terms unless specifically scoped: `t('knowledge_base')` not `t('policy_documents')`
+- Add translation keys to ALL language files: `zh-CN.ts`, `en-US.ts`, `zh-TW.ts`
+- Remove unused translation keys when replacing with generic ones
+
+### Data Modeling and Content Management
+
+#### Content Model Patterns
+
+- Use ContentModel with configured client from mobx-github
+- Import configuration via `'./Base'` to ensure proper GitHub client setup
+- Handle Base64 content decoding when processing GitHub API responses
+
+#### Tree Structure and Navigation
+
+- Use `treeFrom` utility from web-utility for hierarchical data structures
+- Follow established patterns for tree node organization and navigation
+
+### GitHub Integration Standards
+
+#### API Usage Patterns
+
+- Import configured `githubClient` from `models/Base.ts`
+
+#### Authentication and Rate Limiting
+
+- GitHub API authentication is configured in `models/Base.ts`
+- Use the configured client to avoid rate limiting and authentication issues
+- Don't create separate GitHub API instances
+
+### Build and Development Process
+
+#### Pre-commit Standards
+
+1. **Run linting**: `pnpm lint` to auto-fix formatting
+2. **Check build**: Ensure `pnpm build` passes
+3. **Validate translations**: Verify all text is properly translated
+4. **Remove unused code**: Clean up unused imports and translation keys
+
+#### Code Review Compliance
+
+- **Follow exact code suggestions** from reviews when provided
+- Use **minimal approach** - only include explicitly requested functionality
+- **Don't add extra features** not specified in requirements
+- **Address reviewer feedback completely** before requesting re-review
+
+## Common Commands Reference
+
+### Package Management
+
+```bash
+pnpm install          # Install dependencies (1-3 minutes)
+pnpm --version        # Check pnpm version
+```
+
+### Development
+
+```bash
+pnpm dev             # Start development server (5-15s)
+pnpm build           # Production build (30s-2min)
+pnpm start           # Start production server
+```
+
+### Code Quality
+
+```bash
+pnpm lint            # Run ESLint with auto-fix (15s)
+pnpm test            # Run tests (lint-staged + lint, 15s)
+```
+
+## Troubleshooting
+
+### Common Issues and Solutions
+
+#### Build and Development Issues
+
+- **"Unsupported engine" warnings**: Expected on Node.js <22, development still works
+- **Build hangs**: Never cancel builds - they may take several minutes, set appropriate timeouts
+- **Missing dependencies**: Always run `pnpm install` first
+
+#### Component and Styling Issues
+
+- **Custom HTML not working**: Replace with React Bootstrap components
+- **Translation not showing**: Ensure all text uses `t()` function and keys exist in all language files
+- **GitHub API errors**: Verify you're using configured `githubClient` from `models/Base.ts`
+
+#### Data and Content Issues
+
+- **Base64 content errors**: Use `atob(item.content)` to decode GitHub API responses
+- **Missing content**: Check ContentModel configuration and repository access
+- **Tree structure problems**: Use `treeFrom()` utility from web-utility
+
+### Development Environment Setup
+
+- Clear browser cache if components don't render properly
+- Restart development server after major configuration changes
+- Verify all translation files are updated when adding new keys
+
+## Project-Specific Patterns
+
+### Wiki System Architecture
+
+- Uses GitHub ContentModel to access policy documents from `fpsig/open-source-policy` repository
+- Renders markdown content with front-matter metadata
+- Supports hierarchical document structure with breadcrumb navigation
+
+### License Filter Integration
+
+- Interactive multi-step license selection process
+- Uses `license-filter` package for license recommendation logic
+- Supports multiple languages with comprehensive i18n coverage
+
+### Volunteer Management
+
+- Displays GitHub organization contributors
+- Integrates with OSS Insight widgets for contributor analytics
+- Uses GitHub API for real-time contributor data
+
+Always prioritize these project-specific standards over generic Next.js or React guidance when working in this specific codebase.