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/utils/json.ts

@@ -7,7 +7,10 @@ export function parseJSON<T>(json: string | null | undefined, fallback: T) {
   try {
     const raw = json
       .trim()
+      .replace(/^```js\s*/, "")
       .replace(/^```json\s*/, "")
+      .replace(/^```ts\s*/, "")
+      .replace(/^```plaintext\s*/, "")
       .replace(/^```\s*/, "")
       .replace(/\s*```$/, "");
     return parse(raw) as T;