refactor: overhaul UI for streamlined user experience

Redesign navigation, home overview, user portrait, and valuation pages
with improved functionality and responsive design.

Co-authored-by: null <4804959+fnvtk@users.noreply.github.com>

app/api/database-structure/route.ts

@@ -0,0 +1,25 @@
+import { NextResponse } from "next/server"
+import { getDatabases, getDatabaseStructure } from "@/lib/db-connector"
+
+export async function GET(request: Request) {
+  try {
+    const { searchParams } = new URL(request.url)
+    const database = searchParams.get("database")
+
+    if (database) {
+      // 获取指定数据库的结构
+      const structure = await getDatabaseStructure(database)
+      return NextResponse.json({ success: true, data: structure })
+    } else {
+      // 获取所有数据库列表
+      const databases = await getDatabases()
+      return NextResponse.json({ success: true, data: databases })
+    }
+  } catch (error) {
+    console.error("数据库结构查询失败:", error)
+    return NextResponse.json(
+      { success: false, message: "数据库结构查询失败", error: (error as Error).message },
+      { status: 500 },
+    )
+  }
+}