Revert "重构板块资金流向：行业/概念改用独立 path，后端排序，前端不缓存直接请求"

This reverts commit eea2ce86d0.

src/lib/stock-api.ts

@@ -460,23 +460,15 @@ export interface SectorResponse {
 }
 
 /**
- * 获取东方财富板块列表
- * 行业/概念走不同 path（/industry、/concept），避免上游反代按 path 缓存忽略 query 导致数据串味
+ * 获取东方财富板块列表（按主力净流入排序）
  * @param type industry=行业板块, concept=概念板块
- * @param sort mainNetInflow=资金流入, changePercent=涨幅%
- * @param order asc=升序, desc=降序
  */
-export async function fetchSectors(
-  type: SectorType,
-  opts?: { sort?: "mainNetInflow" | "changePercent"; order?: "asc" | "desc"; signal?: AbortSignal },
-): Promise<SectorItem[]> {
+export async function fetchSectors(type: SectorType, signal?: AbortSignal): Promise<SectorItem[]> {
   const baseUrl = getApiBaseUrl();
-  const sort = opts?.sort ?? "mainNetInflow";
-  const order = opts?.order ?? "desc";
-  const url = `${baseUrl}/api/sectors/${type}?sort=${sort}&order=${order}`;
+  const url = `${baseUrl}/api/sectors?type=${type}`;
 
   try {
-    const resp = await fetch(url, { method: "GET", signal: opts?.signal, cache: "no-store" });
+    const resp = await fetch(url, { method: "GET", signal, cache: "no-store" });
     if (!resp.ok) return [];
     const result: SectorResponse = await resp.json();
     return result.data || [];