完善采购审批流程、企业微信通知和采购专用章

tests/test_money_js.cjs

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+const assert = require('node:assert/strict');
+const money = require('../po_app/static/money.js');
+assert.equal(money.format(money.lineCents('1','0.334') + money.lineCents('1','0.334')), '0.66');
+assert.equal(money.format(money.lineCents('1','2.675')), '2.68');
+assert.equal(money.format(money.lineCents('3','0.3333')), '1.00');
+for (const bad of ['-1','NaN','Infinity','abc','0.00001']) assert.throws(()=>money.lineCents(bad,'1'));
+console.log('Decimal preview checks passed');