重构后端，使其更加权责分明

routes/suppliers.js

@@ -151,4 +151,17 @@ async function remove(req, res) {
   }
 }
 
-module.exports = { list, detail, create, update, remove }
+// GET /api/suppliers/simple —— 简易供应商列表（无数据范围限制，用于下拉选择）
+async function simpleList(req, res) {
+  try {
+    const [rows] = await pool.query(
+      'SELECT id, name FROM suppliers WHERE status = 1 ORDER BY id'
+    )
+    res.json({ code: 0, message: 'ok', data: rows })
+  } catch (e) {
+    console.error('[suppliers simpleList] error:', e)
+    res.status(500).json({ code: 500, message: e.message })
+  }
+}
+
+module.exports = { list, detail, create, update, remove, simpleList }