添加后台线程下载远程图片并写入缓存

app/views/panels/ai_image_panel.py

@@ -264,16 +264,10 @@ def _send_prompt(self):
     if not prompt:
         messagebox.showinfo("提示", "请输入内容")
         return
-    if not _svc.has_api():
-        messagebox.showerror(
-            "API 未配置",
-            "AI 图片 API 尚未接入。\n请在启动时通过 "
-            "app.services.ai_image.set_api_caller(...) 注入真实实现。",
-        )
-        return
 
     _set_requesting(self, True)
-    self.ai_image_status_var.set("请求中…")
+    is_remote_url = _svc.is_remote_image_url(prompt)
+    self.ai_image_status_var.set("下载中…" if is_remote_url else "请求中…")
 
     def _success(record):
         self.root.after(0, lambda: _on_request_done(self, record, None))
@@ -281,6 +275,25 @@ def _send_prompt(self):
     def _error(exc):
         self.root.after(0, lambda: _on_request_done(self, None, exc))
 
+    if is_remote_url:
+        _svc.import_image_from_url_async(
+            prompt,
+            on_success=_success,
+            on_error=_error,
+        )
+        return
+
+    if not _svc.has_api():
+        _set_requesting(self, False)
+        self.ai_image_status_var.set("就绪")
+        messagebox.showerror(
+            "API 未配置",
+            "AI 图片 API 尚未接入。\n"
+            "可直接输入图片 URL 导入，或在启动时通过 "
+            "app.services.ai_image.set_api_caller(...) 注入真实实现。",
+        )
+        return
+
     _svc.request_image_async(prompt, on_success=_success, on_error=_error)