feat(desktop): wire template welcome_message + quick_commands to chat UI

- Add welcomeMessage/quickCommands fields to Clone interface
- Persist template welcome/quick data via updateClone after creation
- FirstConversationPrompt: prefer template-provided welcome message
  over dynamically generated one
- FirstConversationPrompt: render template quick_commands as chips
  instead of hardcoded QUICK_ACTIONS when available
- Tighten assign/unassign template endpoint permissions from model:read
  to relay:use (self-service operation for all authenticated users)

desktop/src/store/agentStore.ts

@@ -36,6 +36,8 @@ export interface Clone {
   notes?: string; // 用户备注
   onboardingCompleted?: boolean; // 是否完成首次引导
   source_template_id?: string; // 模板来源 ID
+  welcomeMessage?: string; // 模板预设欢迎语
+  quickCommands?: Array<{ label: string; command: string }>; // 模板预设快捷命令
 }
 
 export interface UsageStats {
@@ -226,10 +228,29 @@ export const useAgentStore = create<AgentStore>((set, get) => ({
             console.warn('Failed to persist temperature/max_tokens:', e);
           }
         }
+
+        // Persist welcome_message + quick_commands as clone metadata
+        if (template.welcome_message || (template.quick_commands && template.quick_commands.length > 0)) {
+          try {
+            await client.updateClone(cloneId, {
+              welcomeMessage: template.welcome_message || '',
+              quickCommands: template.quick_commands || [],
+            });
+          } catch (e) {
+            console.warn('Failed to persist welcome_message/quick_commands:', e);
+          }
+        }
       }
 
       await get().loadClones();
-      return result?.clone;
+
+      // Merge template welcome/quick data into the returned clone for immediate use
+      const createdClone = result?.clone as Record<string, unknown> | undefined;
+      if (createdClone) {
+        if (template.welcome_message) createdClone.welcomeMessage = template.welcome_message;
+        if (template.quick_commands?.length) createdClone.quickCommands = template.quick_commands;
+      }
+      return createdClone as Clone | undefined;
     } catch (error) {
       set({ error: String(error) });
       return undefined;