优化更新患者信息接口，简化文件上传逻辑；修正身份证号码解析函数的区域代码提取

src/utils/idCard.ts

@@ -4,11 +4,11 @@ export function parseRegionCodesFromId(idNo: string | null | undefined) {
   const s = String(idNo).trim();
   // 身份证号码前6位为行政区划代码
   if (!/^[0-9]{6,}/.test(s)) return result;
-  const first6 = s.slice(4, 6);
-  const first4 = s.slice(2, 4);
+  const first6 = s.slice(0, 6);
+  const first4 = s.slice(0, 4);
   const first2 = s.slice(0, 2);
-  result.county = first6;
-  result.city = `${first4}`;
-  result.province = `${first2}`;
+  result.county = first6; // 6位县级代码
+  result.city = `${first4}`; // 市级代码：前4位+00
+  result.province = `${first2}`; // 省级代码：前2位+0000
   return result;
 }