feat: add deep think feature (#311)

* feat: implement backend logic

* feat: implement api/config endpoint

* rename the symbol

* feat: re-implement configuration at client-side

* feat: add client-side of deep thinking

* fix backend bug

* feat: add reasoning block

* docs: update readme

* fix: translate into English

* fix: change icon to lightbulb

* feat: ignore more bad cases

* feat: adjust thinking layout, and implement auto scrolling

* docs: add comments

---------

Co-authored-by: Henry Li <henry1943@163.com>

web/src/core/api/config.ts

@@ -0,0 +1,25 @@
+import { type DeerFlowConfig } from "../config/types";
+
+import { resolveServiceURL } from "./resolve-service-url";
+
+declare global {
+  interface Window {
+    __deerflowConfig: DeerFlowConfig;
+  }
+}
+
+export async function loadConfig() {
+  const res = await fetch(resolveServiceURL("./config"));
+  const config = await res.json();
+  return config;
+}
+
+export function getConfig(): DeerFlowConfig {
+  if (
+    typeof window === "undefined" ||
+    typeof window.__deerflowConfig === "undefined"
+  ) {
+    throw new Error("Config not loaded");
+  }
+  return window.__deerflowConfig;
+}