🎨 feat(home): redesign homepage hero section with improved layout and multilingual support

- Remove system name display from homepage title
- Replace with unified gateway branding: "统一的大模型接口网关"
- Add subtitle highlighting key benefits: price, stability, no subscription
- Implement language-specific title rendering:
  - English: Two-line layout ("The Unified" / "LLMs API Gateway")
  - Chinese: Single-line layout for better readability
- Increase title font sizes for better visual hierarchy
- Adjust vertical padding for improved centering
- Enhance overall visual appeal and user experience

This update modernizes the homepage presentation and provides better
localization support for different language preferences.

web/src/i18n/locales/en.json

@@ -1406,7 +1406,8 @@
   "可在初始化后修改": "Can be modified after initialization",
   "初始化系统": "Initialize system",
   "支持众多的大模型供应商": "Supporting various LLM providers",
-  "新一代大模型网关与AI资产管理系统，一键接入主流大模型，轻松管理您的AI资产": "Next-generation LLM gateway and AI asset management system, one-click integration with mainstream models, easily manage your AI assets",
+  "统一的大模型接口网关": "The Unified LLMs API Gateway",
+  "更好的价格，更好的稳定性，无需订阅": "Better price, better stability, no subscription required",
   "开始使用": "Get Started",
   "关于我们": "About Us",
   "关于项目": "About Project",