feat: support uploaded images in debug voice preview

Allow paste/drag temporary image assets so vision turns work without a live camera frame.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/lib/api.ts

@@ -389,6 +389,30 @@ export const conversationsApi = {
     request<{ ok: boolean }>(`/api/conversations/${id}`, { method: "DELETE" }),
 };
 
+// ---------- 调试会话临时图片 ----------
+export type InputImageAsset = {
+  assetToken: string;
+  width: number;
+  height: number;
+  sizeBytes: number;
+};
+
+export const inputAssetsApi = {
+  uploadImage: (file: File) => {
+    const body = new FormData();
+    body.append("file", file);
+    return request<InputImageAsset>("/api/input-assets/image", {
+      method: "POST",
+      body,
+    });
+  },
+  remove: (assetToken: string) =>
+    request<{ ok: boolean }>(
+      `/api/input-assets/${encodeURIComponent(assetToken)}`,
+      { method: "DELETE" },
+    ),
+};
+
 // ---------- 工具 ----------
 export type ToolStatus = "active" | "archived" | "draft";
 export type ToolExecutionMode = "immediate" | "async";