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

lib/utils.ts

@@ -0,0 +1,54 @@
+import dayjs from "dayjs";
+
+export function formatNumber(n: number): string {
+  return n.toLocaleString("en-US");
+}
+
+export function formatTokens(n: number): string {
+  if (n >= 1_000_000_000) return `${(n / 1_000_000_000).toFixed(1)}B`;
+  if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(1)}M`;
+  if (n >= 1_000) return `${(n / 1_000).toFixed(1)}K`;
+  return String(n);
+}
+
+export function formatUSD(n: number): string {
+  if (n >= 1000) return `$${n.toLocaleString("en-US", { maximumFractionDigits: 0 })}`;
+  if (n >= 1) return `$${n.toFixed(2)}`;
+  if (n >= 0.01) return `$${n.toFixed(3)}`;
+  return `$${n.toFixed(4)}`;
+}
+
+export function formatDate(iso: string): string {
+  return dayjs(iso).format("YYYY-MM-DD HH:mm:ss");
+}
+
+// 预设时间范围
+export type TimeRange = "today" | "7d" | "30d" | "all" | "custom";
+
+export function getTimeRange(range: TimeRange): { start?: number; end?: number } {
+  const now = dayjs();
+  switch (range) {
+    case "today":
+      return { start: now.startOf("day").unix(), end: now.unix() };
+    case "7d":
+      return { start: now.subtract(7, "day").startOf("day").unix(), end: now.unix() };
+    case "30d":
+      return { start: now.subtract(30, "day").startOf("day").unix(), end: now.unix() };
+    case "all":
+      return {};
+    default:
+      return {};
+  }
+}
+
+export function buildQuery(
+  base: string,
+  params: Record<string, string | number | undefined>
+): string {
+  const sp = new URLSearchParams();
+  for (const [k, v] of Object.entries(params)) {
+    if (v !== undefined && v !== "") sp.set(k, String(v));
+  }
+  const qs = sp.toString();
+  return qs ? `${base}?${qs}` : base;
+}