feat(codegen): improve service name mapping for DSL constants

- Use same naming logic as service client generation (clientName function)
- Apply sanitizeClientName() to remove API/Client/Service suffixes
- Apply toPascalCase() for consistent naming
- Generated names now match client names: LambdaClient → LambdaOperations
- Verified with Lambda, S3, and DynamoDB services

Examples:
- Lambda service: LambdaOperations (was AwsgirapiserviceOperations)
- S3 service: S3Operations (was Amazons3Operations)
- DynamoDB service: DynamoDbOperations (was AmazondynamodbOperations)

🤖 Assisted by Amazon Q Developer

Author: ianbotsf

codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/DslConstantsIntegration.kt

@@ -12,6 +12,7 @@ import software.amazon.smithy.kotlin.codegen.core.KotlinWriter
 import software.amazon.smithy.kotlin.codegen.core.withBlock
 import software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration
 import software.amazon.smithy.kotlin.codegen.model.expectShape
+import software.amazon.smithy.kotlin.codegen.utils.toPascalCase
 import software.amazon.smithy.model.Model
 import software.amazon.smithy.model.knowledge.TopDownIndex
 import software.amazon.smithy.model.shapes.OperationShape
@@ -47,7 +48,7 @@ class DslConstantsIntegration : KotlinIntegration {
 
     override fun writeAdditionalFiles(ctx: CodegenContext, delegator: KotlinDelegator) {
         val service = ctx.model.expectShape<ServiceShape>(ctx.settings.service)
-        val serviceName = service.id.name.lowercase()
+        val serviceName = getServiceName(ctx.settings.sdkId)
 
         // Get all operations for this service
         val operations = TopDownIndex
@@ -63,6 +64,22 @@ class DslConstantsIntegration : KotlinIntegration {
         generateOperationConstants(ctx, delegator, serviceName, operations)
     }
 
+    /**
+     * Generate the service name using the same logic as service client generation.
+     * This ensures consistency between client names (e.g., "LambdaClient") and 
+     * constants names (e.g., "LambdaOperations").
+     */
+    private fun getServiceName(sdkId: String): String {
+        return sdkId.sanitizeClientName().toPascalCase()
+    }
+    
+    /**
+     * Sanitize the service name by removing common suffixes, following the same
+     * logic as the service client naming in KotlinSymbolProvider.
+     */
+    private fun String.sanitizeClientName(): String =
+        replace(Regex("(API|Client|Service)$", setOf(RegexOption.IGNORE_CASE)), "")
+    
     /**
      * Generate operation constants for a specific service
      */
@@ -72,7 +89,7 @@ class DslConstantsIntegration : KotlinIntegration {
         serviceName: String,
         operations: List<OperationShape>
     ) {
-        val className = "${serviceName.replaceFirstChar { it.uppercase() }}Operations"
+        val className = "${serviceName}Operations"
         val fileName = "$className.kt"
 
         // Generate the file content