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/saas-prompt.ts

@@ -0,0 +1,46 @@
+/**
+ * SaaS Prompt OTA Methods — Mixin
+ *
+ * Installs prompt OTA methods onto SaaSClient.prototype.
+ * Uses the same mixin pattern as gateway-api.ts.
+ */
+
+import type {
+  PromptCheckResult,
+  PromptTemplateInfo,
+  PromptVersionInfo,
+  PaginatedResponse,
+} from './saas-types';
+
+export function installPromptMethods(ClientClass: { prototype: any }): void {
+  const proto = ClientClass.prototype;
+
+  /** Check for prompt updates (OTA) */
+  proto.checkPromptUpdates = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, deviceId: string, currentVersions: Record<string, number>): Promise<PromptCheckResult> {
+    return this.request<PromptCheckResult>('POST', '/api/v1/prompts/check', {
+      device_id: deviceId,
+      versions: currentVersions,
+    });
+  };
+
+  /** List all prompt templates */
+  proto.listPrompts = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, params?: { category?: string; source?: string; status?: string; page?: number; page_size?: number }): Promise<PaginatedResponse<PromptTemplateInfo>> {
+    const qs = params ? '?' + new URLSearchParams(params as Record<string, string>).toString() : '';
+    return this.request<PaginatedResponse<PromptTemplateInfo>>('GET', `/api/v1/prompts${qs}`);
+  };
+
+  /** Get prompt template by name */
+  proto.getPrompt = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, name: string): Promise<PromptTemplateInfo> {
+    return this.request<PromptTemplateInfo>('GET', `/api/v1/prompts/${encodeURIComponent(name)}`);
+  };
+
+  /** List prompt versions */
+  proto.listPromptVersions = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, name: string): Promise<PromptVersionInfo[]> {
+    return this.request<PromptVersionInfo[]>('GET', `/api/v1/prompts/${encodeURIComponent(name)}/versions`);
+  };
+
+  /** Get specific prompt version */
+  proto.getPromptVersion = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, name: string, version: number): Promise<PromptVersionInfo> {
+    return this.request<PromptVersionInfo>('GET', `/api/v1/prompts/${encodeURIComponent(name)}/versions/${version}`);
+  };
+}