🎨 refactor(model-pricing/header): unify header design, extract SearchActions, and improve skeleton

- Extract SearchActions.jsx and replace inline renderSearchActions in PricingVendorIntro.jsx for reuse
- Refactor PricingVendorIntro.jsx:
  - Introduce renderHeaderCard(), tagStyle, getCoverStyle(), and MAX_VISIBLE_AVATARS constant
  - Standardize vendor header cover (gradient + background image) and tag contrast
  - Use border instead of ring for vendor badges; unify visuals and remove Tailwind ring dependency
  - Rotate vendors every 2s only when filterVendor === 'all' and vendor count > 3
  - Remove unused imports; keep prop surface minimal; pass setShowFilterModal downward only
- Refactor PricingVendorIntroSkeleton.jsx:
  - Add getCoverStyle() and rect() helpers; rebuild skeleton to match final UI
  - Replace invalid Skeleton.Input usage; add missing keys; unify colors/borders/radius
- Update PricingTopSection.jsx:
  - Manage filter modal locally; drop redundant prop passing
- Update PricingVendorIntroWithSkeleton.jsx:
  - Align prop interface; forward only required props and keep useMinimumLoadingTime
- Add: web/src/components/table/model-pricing/layout/header/SearchActions.jsx
- Lint: all files pass; no dark:* classes present in this scope

Files touched:
- web/src/components/table/model-pricing/layout/header/PricingTopSection.jsx
- web/src/components/table/model-pricing/layout/header/PricingVendorIntro.jsx
- web/src/components/table/model-pricing/layout/header/PricingVendorIntroWithSkeleton.jsx
- web/src/components/table/model-pricing/layout/header/PricingVendorIntroSkeleton.jsx
- web/src/components/table/model-pricing/layout/header/SearchActions.jsx (new)

web/src/i18n/locales/en.json

@@ -1201,7 +1201,7 @@
   "兑换码创建成功，是否下载兑换码？": "Redemption code created successfully. Do you want to download it?",
   "兑换码将以文本文件的形式下载，文件名为兑换码的名称。": "The redemption code will be downloaded as a text file, with the filename being the redemption code name.",
   "模型价格": "Model price",
-  "按K显示单位": "Display in K units",
+  "按K显示单位": "Display in K",
   "可用分组": "Available groups",
   "您的默认分组为：{{group}}，分组倍率为：{{ratio}}": "Your default group is: {{group}}, group ratio: {{ratio}}",
   "按量计费费用 = 分组倍率 × 模型倍率 × （提示token数 + 补全token数 × 补全倍率）/ 500000 （单位：美元）": "The cost of pay-as-you-go = Group ratio × Model ratio × (Prompt token number + Completion token number × Completion ratio) / 500000 (Unit: USD)",