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/rules/patterns.mdc

@@ -0,0 +1,58 @@
+---
+description: NestJS API response format, feature modules, and Drizzle repository pattern
+globs: "**/*.ts"
+alwaysApply: false
+---
+
+# Common Patterns
+
+## API Response Format
+
+```typescript
+interface ApiResponse<T> {
+  success: boolean
+  data?: T
+  error?: string
+  meta?: {
+    total: number
+    page: number
+    limit: number
+  }
+}
+```
+
+## Feature Module
+
+```typescript
+@Module({
+  imports: [],
+  controllers: [UsersController],
+  providers: [UsersService, UsersRepository],
+  exports: [UsersService],
+})
+export class UsersModule {}
+```
+
+## Repository Pattern (Drizzle)
+
+```typescript
+interface Repository<T> {
+  findAll(filters?: Filters): Promise<T[]>
+  findById(id: string): Promise<T | null>
+  create(data: CreateDto): Promise<T>
+  update(id: string, data: UpdateDto): Promise<T>
+  delete(id: string): Promise<void>
+}
+```
+
+## Skeleton Projects
+
+When implementing new functionality:
+1. Search for battle-tested NestJS module patterns
+2. Use parallel agents to evaluate options:
+   - Security assessment
+   - Extensibility analysis
+   - Relevance scoring
+   - Implementation planning
+3. Clone best match as foundation
+4. Iterate within proven structure