feat: add kotlin commands and skill pack

.cursor/rules/kotlin-patterns.md

@@ -0,0 +1,50 @@
+---
+description: "Kotlin patterns extending common rules"
+globs: ["**/*.kt", "**/*.kts", "**/build.gradle.kts"]
+alwaysApply: false
+---
+# Kotlin Patterns
+
+> This file extends the common patterns rule with Kotlin-specific content.
+
+## Sealed Classes
+
+Use sealed classes/interfaces for exhaustive type hierarchies:
+
+```kotlin
+sealed class Result<out T> {
+    data class Success<T>(val data: T) : Result<T>()
+    data class Failure(val error: AppError) : Result<Nothing>()
+}
+```
+
+## Extension Functions
+
+Add behavior without inheritance, scoped to where they're used:
+
+```kotlin
+fun String.toSlug(): String =
+    lowercase().replace(Regex("[^a-z0-9\\s-]"), "").replace(Regex("\\s+"), "-")
+```
+
+## Scope Functions
+
+- `let`: Transform nullable or scoped result
+- `apply`: Configure an object
+- `also`: Side effects
+- Avoid nesting scope functions
+
+## Dependency Injection
+
+Use Koin for DI in Ktor projects:
+
+```kotlin
+val appModule = module {
+    single<UserRepository> { ExposedUserRepository(get()) }
+    single { UserService(get()) }
+}
+```
+
+## Reference
+
+See skill: `kotlin-patterns` for comprehensive Kotlin patterns including coroutines, DSL builders, and delegation.