feat: sinir deger hesaplayici — Tebliğ md. 79/45 formulleri, 2026 R katsayilari

Formuller kaynagindan alindi (mevzuat.gov.tr Kamu Ihale Genel Tebligi,
kullanicinin Chrome'u uzerinden okundu; formuller Teblig'de gorsel oldugu icin
ekran goruntusunden):
- Md. 79.1.2 hizmet (personel dayali olmayan): SD = ((YM + ΣT)/(n+1)) × R,
  YM'nin %60 alti ve YM ustu teklifler haric
- Md. 79.1.1 personel calistirmaya dayali: SD = kar haric YM
- Md. 62/A.1 (RG 9/4/2026): mal aliminda 79 uygulanir
- Md. 45.1.1 yapim: Tort1/σ/Tort2, C = Tort2/YM, K parcali, SD = K×Tort2/(C×N);
  N 1,00 (B/C/D/E gruplari) veya 1,20 (45.1.1.1)
- R katsayilari: KIK Kurul karari 21.01.2026 (.doc'tan okundu): arac kiralama
  0,77, bilgisayar 0,87, yemek 0,77, muhendislik 0,72, sigorta 0,74, tasima
  0,78, diger 0,78

Dogrulama: Teblig'in kendi 45.2 ornegi (YM 100.000, N 1,20, 12 teklif) ile
birebir — Tort1 66.270,00, σ 20.317,05, Tort2 63.237,50, C 0,632, K 0,627,
SD 52.281,00. Yuvarlama kurallari ornekteki gibi (2/3 ondalik).

Arac: ust menude "Sinir Deger"; alim turu, YM, teklif listesi, R/N secimi,
"benim teklifim sinirin altinda mi" uyarisi, adim adim hesap.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/App.jsx

@@ -21,6 +21,7 @@ import { ResultSearch } from './components/tools/ResultSearch';
 import { TenderCalendar } from './components/tools/TenderCalendar';
 import { ContractSearch } from './components/tools/ContractSearch';
 import { VatCalculator } from './components/tools/VatCalculator';
+import { SinirDeger } from './components/tools/SinirDeger';
 import { PriceAnalysis } from './components/tools/PriceAnalysis';
 import { CompetitorRadar } from './components/tools/CompetitorRadar';
 import { DocumentVault } from './components/tools/DocumentVault';
@@ -61,6 +62,7 @@ const MainContent = () => {
       {activeTab === 'takvim' && <TenderCalendar />}
       {activeTab === 'sozlesme' && <ContractSearch />}
       {activeTab === 'kdv' && <VatCalculator />}
+      {activeTab === 'sinir' && <SinirDeger />}
       {activeTab === 'fiyat' && <PriceAnalysis />}
       {activeTab === 'kanban' && <KanbanBoard />}
       {activeTab === 'rakip_radar' && <CompetitorRadar />}