fix(api): 纠正 Drizzle ORM 的 eq 操作符语法，修复总览页面 500 崩溃

src/actions/portfolio.ts

@@ -3,7 +3,7 @@
 import { db } from '@/db';
 import { transactions, assets } from '@/db/schema';
 import Big from 'big.js';
-import { desc } from 'drizzle-orm';
+import { desc, eq } from 'drizzle-orm';
 
 export async function getPortfolioPositions() {
   const allTransactions = await db
@@ -16,7 +16,7 @@ export async function getPortfolioPositions() {
       assetBaseCurrency: assets.baseCurrency,
     })
     .from(transactions)
-    .leftJoin(assets, assets.id.eq(transactions.assetId))
+    .leftJoin(assets, eq(assets.id, transactions.assetId))
     .orderBy(desc(transactions.executedAt));
 
   const holdings = new Map<string, {