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/db.ts

@@ -0,0 +1,18 @@
+import { Pool, type QueryResultRow } from "pg";
+
+const pool = new Pool({
+  connectionString: process.env.PG_CONNECTION_STRING,
+  max: 10,
+  idleTimeoutMillis: 30000,
+  connectionTimeoutMillis: 5000,
+});
+
+export async function query<T extends QueryResultRow = QueryResultRow>(
+  text: string,
+  params?: (string | number | boolean | null)[]
+): Promise<T[]> {
+  const { rows } = await pool.query<T>(text, params);
+  return rows;
+}
+
+export default pool;