🚀 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/components/table/model-pricing/layout/PricingPage.jsx

@@ -72,7 +72,6 @@ const PricingPage = () => {
         visible={pricingData.showModelDetail}
         onClose={pricingData.closeModelDetail}
         modelData={pricingData.selectedModel}
-        selectedGroup={pricingData.selectedGroup}
         groupRatio={pricingData.groupRatio}
         usableGroup={pricingData.usableGroup}
         currency={pricingData.currency}
@@ -81,6 +80,7 @@ const PricingPage = () => {
         showRatio={allProps.showRatio}
         vendorsMap={pricingData.vendorsMap}
         endpointMap={pricingData.endpointMap}
+        autoGroups={pricingData.autoGroups}
         t={pricingData.t}
       />
     </div>