fix: carry source-backed bid validity into preparation drafts

tests/bid-terms.test.mjs

@@ -0,0 +1,22 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {extractBidValidity,bidValidityForForm} from '../src/services/bidTerms.js';
+import {qualifyAnalysis} from '../server/analysis-quality.mjs';
+test('bid validity is structured from source with exact clause evidence',()=>{
+  const source='Teslimat 15 gün. TEKLİFLERİN GEÇERLİLİK SÜRESİ ihale tarihinden itibaren 120 (yüzyirmi) takvim günüdür.';
+  const terms=extractBidValidity(source);
+  assert.equal(terms.days,120);
+  assert.equal(source.slice(terms.evidence[0].start,terms.evidence[0].end),terms.evidence[0].quote);
+  assert.equal(extractBidValidity('Garanti süresi 60 gün. Belge geçerlilik süresi 90 gün.').status,'not_found');
+  const result=qualifyAnalysis({},{text:source});
+  assert.equal(result.procurementTerms.bidValidity.days,120);
+  assert.equal(bidValidityForForm('',JSON.parse(JSON.stringify(result.procurementTerms.bidValidity))).days,120);
+});
+test('conflicting clauses remain unresolved instead of choosing the first duration',()=>{
+  const a='Teklif geçerlilik süresi 120 takvim günü.';
+  const b='Tekliflerin geçerlilik süresi 60 gündür.';
+  assert.equal(extractBidValidity(a+' '+b).status,'conflict');
+  assert.equal(bidValidityForForm(a,extractBidValidity(b)).status,'conflict');
+  assert.equal(qualifyAnalysis({},{text:a+' '+b}).sourceReview.status,'partial');
+  assert.equal(extractBidValidity(a+' '+a).days,120);
+});