🚀 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.

controller/pricing.go

@@ -42,9 +42,10 @@ func GetPricing(c *gin.Context) {
 		"success":      true,
 		"data":         pricing,
 		"vendors":      model.GetVendors(),
-		        "group_ratio":  groupRatio,
+		"group_ratio":  groupRatio,
         "usable_group": usableGroup,
         "supported_endpoint": model.GetSupportedEndpointMap(),
+        "auto_groups": setting.AutoGroups,
     })
 }