feat(web-admin): add RMB uppercase converter for OA money field

Pure function with node:test coverage for zero, jiao/fen, and range limits.

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

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

@@ -0,0 +1,38 @@
+// web-admin/src/utils/rmb-upper.test.ts
+import { describe, it } from 'node:test'
+import assert from 'node:assert/strict'
+import { toRmbUpper } from './rmb-upper'
+
+describe('toRmbUpper', () => {
+  it('zero', () => {
+    assert.equal(toRmbUpper(0), '零元整')
+  })
+  it('integer', () => {
+    assert.equal(toRmbUpper(1), '壹元整')
+    assert.equal(toRmbUpper(10), '壹拾元整')
+    assert.equal(toRmbUpper(100), '壹佰元整')
+    assert.equal(toRmbUpper(1234), '壹仟贰佰叁拾肆元整')
+  })
+  it('jiao fen', () => {
+    assert.equal(toRmbUpper(1.23), '壹元贰角叁分')
+    assert.equal(toRmbUpper(0.5), '伍角')
+    assert.equal(toRmbUpper(0.05), '伍分')
+    assert.equal(toRmbUpper(1.2), '壹元贰角')
+    assert.equal(toRmbUpper(1.03), '壹元零叁分')
+  })
+  it('nullish and invalid', () => {
+    assert.equal(toRmbUpper(null), '')
+    assert.equal(toRmbUpper(undefined), '')
+    assert.equal(toRmbUpper(Number.NaN), '')
+    assert.equal(toRmbUpper(-1), '')
+  })
+  it('too large', () => {
+    assert.equal(toRmbUpper(1e12), '金额过大')
+  })
+  it('near max has yuan jiao fen', () => {
+    const s = toRmbUpper(999999999999.99)
+    assert.ok(s.includes('元'))
+    assert.ok(s.includes('角') || s.includes('分'))
+    assert.notEqual(s, '金额过大')
+  })
+})