refactor(desktop): split kernel_commands/pipeline_commands into modules, add SaaS client libs and gateway modules

Split monolithic kernel_commands.rs (2185 lines) and pipeline_commands.rs (1391 lines)
into focused sub-modules under kernel_commands/ and pipeline_commands/ directories.
Add gateway module (commands, config, io, runtime), health_check, and 15 new
TypeScript client libraries for SaaS relay, auth, admin, telemetry, and kernel
sub-systems (a2a, agent, chat, hands, skills, triggers).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/lib/request-helper.ts

@@ -151,7 +151,8 @@ export async function requestWithRetry(
         // Try to read response body for error details
         try {
           responseBody = await response.text();
-        } catch {
+        } catch (e) {
+          log.debug('Failed to read response body', { error: e });
           responseBody = '';
         }