feat: add POST /api/cases/parties to store UYAP taraf bilgileri

The UYAP extension now captures the davaci/davali/sanik + vekil data
from the "Taraf Bilgileri" tab and sends it once per case. This
endpoint finds/creates the matching case by title (same lookup used
by registerLocalDocument, now shared via lib/caseLookup.ts) and stores
it in a new cases.parties column - a much more reliable source for
the case detail screen's "Taraflar" info than the AI's own guess from
OCR'd document text.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/controllers/case.controller.ts

@@ -2,6 +2,7 @@ import { Response } from 'express';
 import { supabase } from '../lib/supabase';
 import { AuthenticatedRequest } from '../middleware/auth';
 import { runDocumentAnalysis } from './document.controller';
+import { findOrCreateCaseByTitle } from '../lib/caseLookup';
 
 export const createCase = async (req: AuthenticatedRequest, res: Response) => {
   try {
@@ -72,6 +73,36 @@ export const summarizeCase = async (req: AuthenticatedRequest, res: Response) =>
   }
 };
 
+// UYAP Evrak İndirici eklentisinin "Taraf Bilgileri" sekmesinden yakaladığı
+// davacı/davalı/sanık + vekil bilgisini kaydeder. AI'nin OCR metninden tahmin
+// ettiği "Taraflar" alanından çok daha güvenilir — doğrudan UYAP'ın yapılandırılmış
+// verisi. case_title ile eşleştirme registerLocalDocument ile aynı mantık.
+export const updateCaseParties = async (req: AuthenticatedRequest, res: Response) => {
+  try {
+    const userId = req.user?.id;
+    const { case_title, parties } = req.body || {};
+
+    if (!case_title || !Array.isArray(parties) || parties.length === 0) {
+      return res.status(400).json({ error: 'case_title ve parties zorunludur.' });
+    }
+
+    const caseId = await findOrCreateCaseByTitle(userId as string, case_title);
+
+    const { data, error } = await supabase
+      .from('cases')
+      .update({ parties })
+      .eq('id', caseId)
+      .select('id, title, parties')
+      .single();
+    if (error) throw error;
+
+    res.json({ case: data });
+  } catch (error: any) {
+    console.error('Update Case Parties Error:', error);
+    res.status(500).json({ error: error.message || 'Internal Server Error' });
+  }
+};
+
 export const deleteCase = async (req: AuthenticatedRequest, res: Response) => {
   try {
     const { caseId } = req.params;