fix(saas): remove hardcoded model fallback — dynamic from available models

- service.rs: template model passed as-is (Option<String>), no hardcoded fallback
- saas-types.ts: AgentConfigFromTemplate.model → string | null
- agentStore.ts: when model is null, resolve from saasStore.availableModels[0]
- AgentOnboardingWizard.tsx: restore full file (was corrupted), apply assignTemplate try/catch fix

desktop/src/store/agentStore.ts

@@ -10,6 +10,7 @@ import type { AgentTemplateFull } from '../lib/saas-client';
 import { saasClient } from '../lib/saas-client';
 import { useChatStore } from './chatStore';
 import { useConversationStore } from './chat/conversationStore';
+import { useSaaSStore } from './saasStore';
 import { createLogger } from '../lib/logger';
 
 const log = createLogger('AgentStore');
@@ -192,9 +193,14 @@ export const useAgentStore = create<AgentStore>((set, get) => ({
 
     set({ isLoading: true, error: null });
     try {
-      // Step 1: Call backend to get server-processed config (tools merge, model fallback)
+      // Step 1: Call backend to get server-processed config (tools merge)
       const config = await saasClient.createAgentFromTemplate(template.id);
 
+      // Resolve model: template model > first available SaaS model > 'default'
+      const resolvedModel = config.model
+        ?? useSaaSStore.getState().availableModels[0]?.id
+        ?? 'default';
+
       // Step 2: Create clone with merged data from backend
       const result = await client.createClone({
         name: config.name,
@@ -202,7 +208,7 @@ export const useAgentStore = create<AgentStore>((set, get) => ({
         personality: config.personality,
         scenarios: template.scenarios,
         communicationStyle: config.communication_style,
-        model: config.model,
+        model: resolvedModel,
       });
 
       const cloneId = result?.clone?.id;