feat: Add metadata and descriptions to various documentation pages in Chinese

- Added titles and descriptions to workspace usage, configuration, customization, design principles, installation, integration guide, lead agent, MCP integration, memory system, middleware, quick start, sandbox, skills, subagents, and tools documentation.
- Removed outdated API/Gateway reference and concepts glossary pages.
- Updated configuration reference to reflect current structure and removed unnecessary sections.
- Introduced new model provider documentation for Ark and updated the index page for model providers.
- Enhanced tutorials with titles and descriptions for better clarity and navigation.

frontend/src/components/landing/footer.tsx

@@ -1,9 +1,20 @@
 import { useMemo } from "react";
 
-export function Footer() {
+import { cn } from "@/lib/utils";
+
+export type FooterProps = {
+  className?: string;
+};
+
+export function Footer({ className }: FooterProps) {
   const year = useMemo(() => new Date().getFullYear(), []);
   return (
-    <footer className="container-md mx-auto mt-32 flex flex-col items-center justify-center">
+    <footer
+      className={cn(
+        "container-md mx-auto mt-32 flex flex-col items-center justify-center",
+        className,
+      )}
+    >
       <hr className="from-border/0 to-border/0 m-0 h-px w-full border-none bg-linear-to-r via-white/20" />
       <div className="text-muted-foreground container flex h-20 flex-col items-center justify-center text-sm">
         <p className="text-center font-serif text-lg md:text-xl">