🚀 feat(pricing): clarify “auto” group routing chain and exclude it from price table

Detailed changes
Backend
• `controller/pricing.go` now includes `auto_groups` in `/api/pricing` response, sourced from `setting.AutoGroups`.

Frontend
• `useModelPricingData.js`
  – Parses `auto_groups` and exposes `autoGroups` state.
• `PricingPage.jsx` → `ModelDetailSideSheet.jsx` → `ModelPricingTable.jsx`
  – Thread `autoGroups` through component tree.
• `ModelPricingTable.jsx`
  – Removes deprecated `getGroupDescription` / `Tooltip`.
  – Filters out `auto` when building price table rows.
  – Renders a descriptive banner: “auto 分组调用链路 → auto → group1 → …”, clarifying fallback order without showing prices.
• Minor i18n tweak: adds `auto分组调用链路` key for the banner text.

Why
Users were confused by the “auto” tag appearing alongside regular groups with no price.
This change:
1. Makes the routing chain explicit.
2. Keeps the pricing table focused on billable groups.

No breaking API changes; existing clients can ignore the new `auto_groups` field.

web/src/hooks/model-pricing/useModelPricingData.js

@@ -49,6 +49,7 @@ export const useModelPricingData = () => {
   const [groupRatio, setGroupRatio] = useState({});
   const [usableGroup, setUsableGroup] = useState({});
   const [endpointMap, setEndpointMap] = useState({});
+  const [autoGroups, setAutoGroups] = useState([]);
 
   const [statusState] = useContext(StatusContext);
   const [userState] = useContext(UserContext);
@@ -160,7 +161,7 @@ export const useModelPricingData = () => {
     setLoading(true);
     let url = '/api/pricing';
     const res = await API.get(url);
-    const { success, message, data, vendors, group_ratio, usable_group, supported_endpoint } = res.data;
+    const { success, message, data, vendors, group_ratio, usable_group, supported_endpoint, auto_groups } = res.data;
     if (success) {
       setGroupRatio(group_ratio);
       setUsableGroup(usable_group);
@@ -174,6 +175,7 @@ export const useModelPricingData = () => {
       }
       setVendorsMap(vendorMap);
       setEndpointMap(supported_endpoint || {});
+      setAutoGroups(auto_groups || []);
       setModelsFormat(data, group_ratio, vendorMap);
     } else {
       showError(message);
@@ -282,6 +284,7 @@ export const useModelPricingData = () => {
     groupRatio,
     usableGroup,
     endpointMap,
+    autoGroups,
 
     // 计算属性
     priceRate,