💱 feat(settings): introduce site-wide quota display type (USD/CNY/TOKENS/CUSTOM)

Replace the legacy boolean “DisplayInCurrencyEnabled” with an injected, type-safe
configuration `general_setting.quota_display_type`, and wire it through the
backend and frontend.

Backend
- Add `QuotaDisplayType` to `operation_setting.GeneralSetting` with injected
  registration via `config.GlobalConfig.Register("general_setting", ...)`.
  Helpers: `IsCurrencyDisplay()`, `IsCNYDisplay()`, `GetQuotaDisplayType()`.
- Expose `quota_display_type` in `/api/status` and keep legacy
  `display_in_currency` for backward compatibility.
- Logger: update `LogQuota` and `FormatQuota` to support USD/CNY/TOKENS. When
  CNY is selected, convert using `operation_setting.USDExchangeRate`.
- Controllers:
  - `billing`: compute subscription/usage amounts based on the selected type
    (USD: divide by `QuotaPerUnit`; CNY: USD→CNY; TOKENS: keep raw tokens).
  - `topup` / `topup_stripe`: treat inputs as “amount” for USD/CNY and as
    token-count for TOKENS; adjust min topup and pay money accordingly.
  - `misc`: include `quota_display_type` in status payload.
- Compatibility: in `model/option.UpdateOption`, map updates to
  `DisplayInCurrencyEnabled` → `general_setting.quota_display_type`
  (true→USD, false→TOKENS). Keep exporting the legacy key in `OptionMap`.

Frontend
- Settings: replace the “display in currency” switch with a Select
  (`general_setting.quota_display_type`) offering USD / CNY / Tokens.
  Provide fallback mapping from legacy `DisplayInCurrencyEnabled`.
- Persist `quota_display_type` to localStorage (keep `display_in_currency`
  for legacy components).
- Rendering helpers: base all quota/price rendering on `quota_display_type`;
  use `usd_exchange_rate` for CNY symbol/values.
- Pricing page: default view currency follows site display type (USD/CNY),
  while TOKENS mode still allows per-view currency toggling when needed.

Notes
- No database migrations required.
- Legacy clients remain functional via compatibility fields.

web/src/components/table/channels/modals/EditChannelModal.jsx

@@ -87,23 +87,7 @@ const REGION_EXAMPLE = {
 
 // 支持并且已适配通过接口获取模型列表的渠道类型
 const MODEL_FETCHABLE_TYPES = new Set([
-  1,
-  4,
-  14,
-  34,
-  17,
-  26,
-  24,
-  47,
-  25,
-  20,
-  23,
-  31,
-  35,
-  40,
-  42,
-  48,
-  43,
+  1, 4, 14, 34, 17, 26, 24, 47, 25, 20, 23, 31, 35, 40, 42, 48, 43,
 ]);
 
 function type2secretPrompt(type) {
@@ -348,7 +332,10 @@ const EditChannelModal = (props) => {
           break;
         case 45:
           localModels = getChannelModels(value);
-          setInputs((prevInputs) => ({ ...prevInputs, base_url: 'https://ark.cn-beijing.volces.com' }));
+          setInputs((prevInputs) => ({
+            ...prevInputs,
+            base_url: 'https://ark.cn-beijing.volces.com',
+          }));
           break;
         default:
           localModels = getChannelModels(value);
@@ -442,7 +429,8 @@ const EditChannelModal = (props) => {
           // 读取 Vertex 密钥格式
           data.vertex_key_type = parsedSettings.vertex_key_type || 'json';
           // 读取企业账户设置
-          data.is_enterprise_account = parsedSettings.openrouter_enterprise === true;
+          data.is_enterprise_account =
+            parsedSettings.openrouter_enterprise === true;
         } catch (error) {
           console.error('解析其他设置失败:', error);
           data.azure_responses_version = '';
@@ -868,7 +856,10 @@ const EditChannelModal = (props) => {
       showInfo(t('请至少选择一个模型！'));
       return;
     }
-    if (localInputs.type === 45 && (!localInputs.base_url || localInputs.base_url.trim() === '')) {
+    if (
+      localInputs.type === 45 &&
+      (!localInputs.base_url || localInputs.base_url.trim() === '')
+    ) {
       showInfo(t('请输入API地址！'));
       return;
     }
@@ -912,7 +903,8 @@ const EditChannelModal = (props) => {
         }
       }
       // 设置企业账户标识，无论是true还是false都要传到后端
-      settings.openrouter_enterprise = localInputs.is_enterprise_account === true;
+      settings.openrouter_enterprise =
+        localInputs.is_enterprise_account === true;
       localInputs.settings = JSON.stringify(settings);
     }
 
@@ -1318,7 +1310,9 @@ const EditChannelModal = (props) => {
                         setIsEnterpriseAccount(value);
                         handleInputChange('is_enterprise_account', value);
                       }}
-                      extraText={t('企业账户为特殊返回格式，需要特殊处理，如果非企业账户，请勿勾选')}
+                      extraText={t(
+                        '企业账户为特殊返回格式，需要特殊处理，如果非企业账户，请勿勾选',
+                      )}
                       initValue={inputs.is_enterprise_account}
                     />
                   )}
@@ -1944,27 +1938,27 @@ const EditChannelModal = (props) => {
                     )}
 
                     {inputs.type === 45 && (
-                        <div>
-                          <Form.Select
-                              field='base_url'
-                              label={t('API地址')}
-                              placeholder={t('请选择API地址')}
-                              onChange={(value) =>
-                                  handleInputChange('base_url', value)
-                              }
-                              optionList={[
-                                {
-                                  value: 'https://ark.cn-beijing.volces.com',
-                                  label: 'https://ark.cn-beijing.volces.com'
-                                },
-                                {
-                                  value: 'https://ark.ap-southeast.bytepluses.com',
-                                  label: 'https://ark.ap-southeast.bytepluses.com'
-                                }
-                              ]}
-                              defaultValue='https://ark.cn-beijing.volces.com'
-                          />
-                        </div>
+                      <div>
+                        <Form.Select
+                          field='base_url'
+                          label={t('API地址')}
+                          placeholder={t('请选择API地址')}
+                          onChange={(value) =>
+                            handleInputChange('base_url', value)
+                          }
+                          optionList={[
+                            {
+                              value: 'https://ark.cn-beijing.volces.com',
+                              label: 'https://ark.cn-beijing.volces.com',
+                            },
+                            {
+                              value: 'https://ark.ap-southeast.bytepluses.com',
+                              label: 'https://ark.ap-southeast.bytepluses.com',
+                            },
+                          ]}
+                          defaultValue='https://ark.cn-beijing.volces.com'
+                        />
+                      </div>
                     )}
                   </Card>
                 )}