feat: enhance cursor rules with practical improvements

[codegen-sh]

Overview

This PR enhances the cursor rules with practical improvements based on the Lambda Curry best practices guide, focusing on actionable guidance without making the rules too long.

🎯 Improvements Implemented

3. Query Key Management Patterns ✅

Added centralized query key management to medusa-admin.mdc:

• Centralized QUERY_KEYS constant for consistency
• Proper query invalidation patterns in mutations
• Examples showing related query invalidation

5. File Organization Rules ✅

Enhanced file organization guidelines:

• Clear directory structure for admin components
• Component, hook, and type file naming conventions
• Co-location and separation of concerns best practices
• Test file organization patterns

6. Verification Checklists ✅

Added comprehensive verification checklists for both backend and admin:

Backend Checklist:

• API endpoint patterns (workflows, validation, responses)
• Workflow best practices (atomicity, rollbacks, types)
• Database considerations (migrations, indexes, constraints)
• Security requirements (validation, auth, sanitization)

Admin Checklist:

• State management (query invalidation, loading states)
• Component patterns (event handling, TypeScript generics)
• Performance (memoization, callbacks, optimization)
• Error handling (async operations, user feedback)

7. Anti-Pattern Examples ✅

Added targeted anti-pattern examples without excessive length:

Backend Examples:

• Business logic in routes vs. workflows
• Missing input validation vs. Zod middleware

Admin Examples:

• Direct API calls vs. query hooks
• Missing event.stopPropagation() vs. proper event handling
• Missing query invalidation vs. proper cache management

🔧 Key Features

• Practical Focus: All examples are actionable and specific
• Concise Format: Anti-patterns are brief but illustrative
• Real-World Patterns: Based on actual implementation needs
• Verification-Driven: Clear checklists for code quality
• Organized Structure: Logical grouping and easy navigation

✅ Benefits

• Faster Code Reviews: Clear verification checklists reduce review time
• Consistent Patterns: Centralized query management and file organization
• Quality Assurance: Anti-patterns help avoid common mistakes
• Developer Productivity: Clear guidelines reduce decision fatigue
• Maintainable Code: Better organization and testing patterns

This implementation follows the Lambda Curry guide's emphasis on practical, actionable rules while maintaining brevity and focus.

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