fix(web-admin): avoid duplicate 零 in RMB uppercase for yi+rest

Add regression tests for 亿到元段间零填充。

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/utils/rmb-upper.test.ts

@@ -35,4 +35,9 @@ describe('toRmbUpper', () => {
     assert.ok(s.includes('角') || s.includes('分'))
     assert.notEqual(s, '金额过大')
   })
+  it('yi to yuan zero padding', () => {
+    assert.equal(toRmbUpper(100000001), '壹亿零壹元整')
+    assert.equal(toRmbUpper(100000010), '壹亿零壹拾元整')
+    assert.equal(toRmbUpper(100010000), '壹亿零壹万元整')
+  })
 })

web-admin/src/utils/rmb-upper.ts

@@ -44,7 +44,7 @@ export function toRmbUpper(value: number | null | undefined): string {
 
   if (yuan > 0) {
     const yi = Math.floor(yuan / 100000000)
-    const wan = Math.floor((yuan % 100000000) / 10000)
+    const wan = Math.floor(yuan / 10000) % 10000
     const rest = yuan % 10000
 
     if (yi > 0) {
@@ -55,11 +55,13 @@ export function toRmbUpper(value: number | null | undefined): string {
         result += '零'
       }
       result += sectionToChinese(wan) + '万'
-    } else if (yi > 0 && rest > 0) {
-      result += '零'
     }
     if (rest > 0) {
-      if ((yi > 0 || wan > 0) && rest < 1000) {
+      if (wan > 0) {
+        if (rest < 1000) {
+          result += '零'
+        }
+      } else if (yi > 0) {
         result += '零'
       }
       result += sectionToChinese(rest)