feat: contract uses num_lh, male avatar, captcha upgrade, full i18n

- Contract buy/close/cancel all use num_lh (contract balance) not num (spot)
- Wallet API returns contract (lh) account data block
- My.php returns user id field for frontend display
- Avatar: DiceBear avataaars male business style
- Captcha: 3x scaled text for readability
- Transfer log descriptions in English
- All billing descriptions in English

application/api/controller/My.php

@@ -35,8 +35,9 @@ class My extends Api
             $is_angel = false;
         }
         $data = [
+            'id' => $this->auth->id,
             'user_id' => $this->auth->id,
-            'avatar' => Config::get('site.image_url').$this->auth->avatar,
+            'avatar' => (strpos($this->auth->avatar, 'http') === 0) ? $this->auth->avatar : Config::get('site.image_url').$this->auth->avatar,
             'nickname' => $this->auth->nickname,
             'email' => $this->auth->email,
             'is_auth' => $auth['status'],