fix: enforce source-backed offer type in bid preparation

src/services/bidTerms.js

@@ -17,3 +17,19 @@ export function bidValidityForForm(announcement, analyzed) {
   const values=[...new Set(evidence.map(e=>e.days).filter(d=>Number.isInteger(d)&&d>0))];
   return {status:values.length>1?'conflict':values.length?'found':'not_found',days:values.length===1?values[0]:null,evidence};
 }
+
+export function extractBidType(text) {
+  const source=String(text || ''),lower=source.toLocaleLowerCase('tr-TR'),evidence=[];
+  for(const [type,label] of [['birim','birim\\s+fiyat'],['goturu','(?:anahtar\\s+teslimi?\\s+)?götürü\\s+bedel']]) {
+    const pattern=new RegExp(`(?:teklif\\s+türü\\s*[:：-]\\s*${label}|${label}\\s+(?:üzerinden\\s+|şeklinde\\s+)?teklif\\s+(?:verilecektir|vereceklerdir|sunulacaktır|alınacaktır))`,'gu');
+    for(const match of lower.matchAll(pattern)) evidence.push({type,quote:source.slice(match.index,match.index+match[0].length),start:match.index,end:match.index+match[0].length});
+  }
+  return summarizeBidType(evidence);
+}
+function summarizeBidType(evidence) {
+  const types=[...new Set(evidence.map(e=>e.type).filter(t=>['birim','goturu'].includes(t)))];
+  return {status:types.length>1?'conflict':types.length?'found':'not_found',type:types.length===1?types[0]:null,evidence};
+}
+export function bidTypeForForm(announcement,analyzed) {
+  return summarizeBidType([...extractBidType(announcement).evidence,...(Array.isArray(analyzed?.evidence)?analyzed.evidence:[])]);
+}