feat: simplify code project creation

src/pages/Chat/CodingChatPanel.tsx

@@ -681,6 +681,25 @@ export function CodingChatPanel({
               }}
             />
           )
+          : agents.length === 0
+            ? (
+              <div className="flex min-h-0 flex-1 items-center justify-center p-6" data-testid="coding-chat-empty-agent">
+                <div className="max-w-sm text-center">
+                  <div className="mx-auto flex h-12 w-12 items-center justify-center rounded-2xl bg-surface-subtle shadow-[0_0_0_1px_rgba(0,0,0,0.06)]">
+                    <Bot className="h-5 w-5 text-muted-foreground" aria-hidden="true" />
+                  </div>
+                  <h1 className="mt-4 text-balance text-lg font-semibold">项目已准备好</h1>
+                  <p className="mt-2 text-pretty text-sm leading-6 text-muted-foreground">
+                    需要开始对话时，再创建一个项目智能体并选择模型即可。
+                  </p>
+                  {onOpenProjectSettings ? (
+                    <Button className="mt-5 min-h-10 rounded-xl" onClick={onOpenProjectSettings}>
+                      创建项目智能体
+                    </Button>
+                  ) : null}
+                </div>
+              </div>
+            )
           : (
             <div className="min-h-0 flex-1" data-testid="coding-conversation-pending" />
           )}