✨ feat(homepage): enhance banner visuals & UX

• Added read-only Base URL input that shows `status.server_address` (fallback `window.location.origin`) and copies value on click.
• Embedded `ScrollList` as input `suffix`; auto-cycles common endpoints every 3 s and allows manual selection.
• Introduced `API_ENDPOINTS` array in `web/src/constants/common.constant.js` for centralized endpoint management.
• Implemented custom CSS to hide ScrollList wheel indicators / scrollbars for a cleaner look.
• Created two blurred colour spheres behind the banner (`blur-ball-indigo`, `blur-ball-teal`) with light-/dark-mode opacity tweaks and lower vertical placement.
• Increased letter-spacing for Chinese heading via conditional `tracking-wide` / `md:tracking-wider` classes to improve readability.
• Misc: updated imports, helper functions, and responsive sizes to keep UI consistent across devices.

web/src/i18n/locales/en.json

@@ -1422,8 +1422,8 @@
   "初始化系统": "Initialize system",
   "支持众多的大模型供应商": "Supporting various LLM providers",
   "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",
+  "更好的价格，更好的稳定性，只需要将模型基址替换为：": "Better price, better stability, no subscription required, just replace the model BASE URL with: ",
+  "获取密钥": "Get Key",
   "关于我们": "About Us",
   "关于项目": "About Project",
   "联系我们": "Contact Us",