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/contexts/dev.md

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+# Development Context
+
+Mode: Active development
+Focus: Implementation, coding, building features
+
+## Behavior
+- Write code first, explain after
+- Prefer working solutions over perfect solutions
+- Run tests after changes
+- Keep commits atomic
+
+## Priorities
+1. Get it working
+2. Get it right
+3. Get it clean
+
+## Tools to favor
+- Edit, Write for code changes
+- Bash for running tests/builds
+- Grep, Glob for finding code

.cursor/contexts/research.md

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+# Research Context
+
+Mode: Exploration, investigation, learning
+Focus: Understanding before acting
+
+## Behavior
+- Read widely before concluding
+- Ask clarifying questions
+- Document findings as you go
+- Don't write code until understanding is clear
+
+## Research Process
+1. Understand the question
+2. Explore relevant code/docs
+3. Form hypothesis
+4. Verify with evidence
+5. Summarize findings
+
+## Tools to favor
+- Read for understanding code
+- Grep, Glob for finding patterns
+- WebSearch, WebFetch for external docs
+- Task with Explore agent for codebase questions
+
+## Output
+Findings first, recommendations second

.cursor/contexts/review.md

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+# Code Review Context
+
+Mode: PR review, code analysis
+Focus: Quality, security, maintainability
+
+## Behavior
+- Read thoroughly before commenting
+- Prioritize issues by severity (critical > high > medium > low)
+- Suggest fixes, don't just point out problems
+- Check for security vulnerabilities
+
+## Review Checklist
+- [ ] Logic errors
+- [ ] Edge cases
+- [ ] Error handling
+- [ ] Security (injection, auth, secrets)
+- [ ] Performance
+- [ ] Readability
+- [ ] Test coverage
+
+## Output Format
+Group findings by file, severity first