feat(desktop): integrate SaaS llm_routing, template API, and onboarding template selection
- Add AgentTemplateAvailable/AgentTemplateFull types and fetchAvailableTemplates/fetchTemplateFull API methods to saas-client - Add llm_routing field to SaaSAccountInfo for admin-configured routing priority - Add availableTemplates state and fetchAvailableTemplates action to saasStore with background fetch on login - Add admin llm_routing priority check in connectionStore connect() to force relay or local mode - Add createFromTemplate action to agentStore with SOUL.md persistence - Add Step 0 template selection to AgentOnboardingWizard with grid layout for template browsing
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