refactor(types): centralize type definitions in shared types file

Move all interface and type definitions to src/types/index.ts to reduce code duplication and improve maintainability. This includes types for components, blog posts, personal info, and localization.

src/components/Footer.tsx

@@ -3,10 +3,7 @@ import { personalInfo } from "@/lib/data";
 import { motion } from "framer-motion";
 import { useState, useEffect } from "react";
 import { defaultLang } from "@/i18n/ui";
-
-interface FooterProps {
-  lang?: Lang;
-}
+import { type FooterProps } from "@/types";
 
 export default function Footer({ lang: propLang }: FooterProps) {
   // 优先使用props传入的语言，如果没有则尝试从HTML lang属性获取