feat: add comprehensive NodeJS development skills and rules

Based on Planner and Memory Manager analysis:

New Skills (8):
- nodejs-express-patterns: App structure, routing, middleware
- nodejs-security-owasp: OWASP Top 10 security practices
- nodejs-testing-jest: Unit/integration tests, mocking
- nodejs-auth-jwt: JWT authentication, OAuth, sessions
- nodejs-error-handling: Error classes, middleware, async handlers
- nodejs-middleware-patterns: Auth, validation, rate limiting
- nodejs-db-patterns: SQLite, PostgreSQL, MongoDB patterns
- nodejs-npm-management: package.json, scripts, dependencies

New Rules:
- nodejs.md: Code style, security, best practices

Updated:
- backend-developer.md: Added skills reference table

Milestone: #48 NodeJS Development Coverage
Related: Planner & Memory Manager analysis results

.kilo/agents/backend-developer.md

@@ -246,6 +246,39 @@ module.exports = errorHandler;
 - DO NOT use synchronous operations in request handlers
 - DO NOT hardcode secrets or credentials
 
+## Skills Reference
+
+This agent uses the following skills for comprehensive Node.js development:
+
+### Core Skills
+| Skill | Purpose |
+|-------|---------|
+| `nodejs-express-patterns` | Express app structure, routing, middleware |
+| `nodejs-error-handling` | Error classes, middleware, async handlers |
+| `nodejs-middleware-patterns` | Authentication, validation, rate limiting |
+| `nodejs-auth-jwt` | JWT authentication, OAuth, sessions |
+| `nodejs-security-owasp` | OWASP Top 10, security best practices |
+
+### Testing & Quality
+| Skill | Purpose |
+|-------|---------|
+| `nodejs-testing-jest` | Unit tests, integration tests, mocking |
+
+### Database
+| Skill | Purpose |
+|-------|---------|
+| `nodejs-db-patterns` | SQLite, PostgreSQL, MongoDB patterns |
+
+### Package Management
+| Skill | Purpose |
+|-------|---------|
+| `nodejs-npm-management` | package.json, scripts, dependencies |
+
+### Rules
+| File | Content |
+|------|---------|
+| `.kilo/rules/nodejs.md` | Code style, security, best practices |
+
 ## Handoff Protocol
 
 After implementation:
@@ -253,7 +286,8 @@ After implementation:
 2. Check security headers
 3. Test error handling
 4. Create database migration
-5. Tag `@CodeSkeptic` for review
+5. Run tests with `npm test`
+6. Tag `@CodeSkeptic` for review
 ## Gitea Commenting (MANDATORY)
 
 **You MUST post a comment to the Gitea issue after completing your work.**