FEAT(cdc): carry iceberg_table_name through the add-tables endpoint

The POST /pipelines/:pipelineId/inputs/:inputId/tables route built its
CdcTable payload field-by-field and silently dropped iceberg_table_name
even though inputsService.addCdcTable/the gRPC AddCdcTable call (and the
protospack CdcTable message) already support it. Widen the inline request
body type and thread the field into the addCdcTable payload; absent for
snowflake, unchanged back-compat.

Co-Authored-By: WOZCODE <contact@withwoz.com>

src/modules/platform-api/platform-api.controller.ts

@@ -1076,6 +1076,9 @@ export class PlatformApiController {
         raw: { table_schema: string; table_name: string };
         qualify: { table_schema: string; table_name: string };
       };
+      // Iceberg destination only (protospack CdcTable.iceberg_table_name);
+      // absent for snowflake, back-compat.
+      iceberg_table_name?: string;
     },
     @User() user: RequestUser,
   ) {
@@ -1090,6 +1093,7 @@ export class PlatformApiController {
       table_name: body.table_name,
       primary_keys: body.primary_keys,
       name: body.table_name,
+      iceberg_table_name: body.iceberg_table_name,
     };
 
     this.logger.info('addTable: appending CDC table to DynamoDB', { inputId, tableName: body.table_name });