feat: API analytics dashboard with i18n and theme support

Next.js full-stack analytics dashboard for new-api.
- Direct PostgreSQL readonly queries on logs table
- 5 pages: Dashboard, Rankings, Aggregation, Logs, Detail
- Dark/Light/System theme with CSS variables
- Chinese/English i18n (default Chinese)
- Recharts with dual Y-axis for input/output tokens
- Lucide icons + Motion animations
- Docker + docker-compose with external sinobridge network, port 8019

app/api/overview/route.ts

@@ -0,0 +1,11 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getOverview } from "@/lib/queries";
+
+export async function GET(req: NextRequest) {
+  const sp = req.nextUrl.searchParams;
+  const startTs = sp.get("start") ? Number(sp.get("start")) : undefined;
+  const endTs = sp.get("end") ? Number(sp.get("end")) : undefined;
+
+  const data = await getOverview(startTs, endTs);
+  return NextResponse.json(data);
+}