Add new skills for backend patterns, coding standards, continuous learning, and NestJS best practices

- Introduced backend patterns skill with guidelines on API design, database optimization, and server-side best practices.
- Added coding standards skill outlining universal coding principles for TypeScript, NestJS, and Node.js development.
- Implemented continuous learning skill to automatically extract reusable patterns from Cursor sessions.
- Created NestJS best practices skill detailing architecture patterns, dependency injection, error handling, and security measures.
- Included various rules and templates for NestJS best practices to ensure production-ready applications.

.cursor/commands/build-fix.md

@@ -0,0 +1,29 @@
+# Build and Fix
+
+Incrementally fix TypeScript and build errors:
+
+1. Run build: npm run build or pnpm build
+
+2. Parse error output:
+   - Group by file
+   - Sort by severity
+
+3. For each error:
+   - Show error context (5 lines before/after)
+   - Explain the issue
+   - Propose fix
+   - Apply fix
+   - Re-run build
+   - Verify error resolved
+
+4. Stop if:
+   - Fix introduces new errors
+   - Same error persists after 3 attempts
+   - User requests pause
+
+5. Show summary:
+   - Errors fixed
+   - Errors remaining
+   - New errors introduced
+
+Fix one error at a time for safety!