feat(saas): industry agent template assignment system

Phase 1-8 of industry-agent-delivery plan:

- DB migration: accounts.assigned_template_id (ON DELETE SET NULL)
- SaaS API: 4 new endpoints (assign/get/unassign/create-agent)
- Service layer: assign_template_to_account, get_assigned_template, unassign_template, create_agent_from_template)
- Types: AssignTemplateRequest, AgentConfigFromTemplate (capabilities merged into tools)
- Frontend SaaS Client: assignTemplate, getAssignedTemplate, unassignTemplate, createAgentFromTemplate
- saasStore: assignedTemplate state + login auto-fetch + actions
- saas-relay-client: fix unused import and saasUrl reference error
- connectionStore: fix relayModel undefined error
- capabilities default to glm-4-flash

- Route registration: new template assignment routes

Cospec and handlers consolidated

Build: cargo check --workspace PASS, tsc --noEmit Pass

desktop/src/store/connectionStore.ts

@@ -472,6 +472,19 @@ export const useConnectionStore = create<ConnectionStore>((set, get) => {
             // agent management local via KernelClient.
             // baseUrl = saasUrl + /api/v1/relay → kernel appends /chat/completions
             // apiKey = SaaS JWT token → sent as Authorization: Bearer <jwt>
+
+            // Fetch available models from SaaS relay (shared by both branches)
+            let relayModels: Array<{ id: string }>;
+            try {
+              relayModels = await saasClient.listModels();
+            } catch {
+              throw new Error('无法获取可用模型列表，请确认管理后台已配置 Provider 和模型');
+            }
+
+            if (relayModels.length === 0) {
+              throw new Error('SaaS 平台没有可用模型，请先在管理后台配置 Provider 和模型');
+            }
+
             if (isTauriRuntime()) {
               if (!session.token) {
                 throw new Error('SaaS 中转模式需要认证令牌，请重新登录 SaaS 平台');
@@ -479,20 +492,8 @@ export const useConnectionStore = create<ConnectionStore>((set, get) => {
 
               const kernelClient = getKernelClient();
 
-              // Fetch available models from SaaS relay
-              let models: Array<{ id: string }>;
-              try {
-                models = await saasClient.listModels();
-              } catch {
-                throw new Error('无法获取可用模型列表，请确认管理后台已配置 Provider 和模型');
-              }
-
-              if (models.length === 0) {
-                throw new Error('SaaS 平台没有可用模型，请先在管理后台配置 Provider 和模型');
-              }
-
               // Use first available model (TODO: let user choose preferred model)
-              const relayModel = models[0];
+              const relayModel = relayModels[0];
 
               kernelClient.setConfig({
                 provider: 'custom',
@@ -525,9 +526,21 @@ export const useConnectionStore = create<ConnectionStore>((set, get) => {
                 baseUrl: `${session.saasUrl}/api/v1/relay`,
               });
             } else {
-              // Non-Tauri (browser) — simple connected state without kernel
-              set({ connectionState: 'connected', gatewayVersion: 'saas-relay' });
-              log.debug('Connected to SaaS relay (browser mode)');
+              // Non-Tauri (browser) — use SaaS relay gateway client for agent listing + chat
+              const { createSaaSRelayGatewayClient } = await import('../lib/saas-relay-client');
+              const relayModelId = relayModels[0].id;
+              const relayClient = createSaaSRelayGatewayClient(session.saasUrl, relayModelId);
+
+              set({
+                connectionState: 'connected',
+                gatewayVersion: 'saas-relay',
+                client: relayClient as unknown as GatewayClient,
+              });
+
+              const { initializeStores } = await import('./index');
+              initializeStores();
+
+              log.debug('Connected to SaaS relay (browser mode)', { relayModel: relayModelId });
             }
             return;
           }