feat: add DELETE /api/cases/:caseId to fully delete a case

Chat panel's trash icon should remove the whole case (not just clear
its chat history) — documents/analyses/chat_messages cascade-delete
via the existing ON DELETE CASCADE foreign keys.

src/controllers/case.controller.ts

@@ -0,0 +1,21 @@
+import { Response } from 'express';
+import { supabase } from '../lib/supabase';
+import { AuthenticatedRequest } from '../middleware/auth';
+
+export const deleteCase = async (req: AuthenticatedRequest, res: Response) => {
+  try {
+    const { caseId } = req.params;
+    if (!caseId) {
+      return res.status(400).json({ error: 'Geçersiz caseId' });
+    }
+    // requireAuth zaten bu caseId'nin isteği yapan kullanıcıya ait olduğunu doğruladı.
+    // documents/analyses/chat_messages tabloları case_id üzerinden ON DELETE CASCADE
+    // ile tanımlı (bkz. sql/1.sql), yani cases satırını silmek hepsini birlikte siliyor.
+    const { error } = await supabase.from('cases').delete().eq('id', caseId);
+    if (error) throw error;
+    res.json({ ok: true });
+  } catch (error: any) {
+    console.error('Delete Case Error:', error);
+    res.status(500).json({ error: error.message || 'Internal Server Error' });
+  }
+};

src/routes/case.routes.ts

@@ -0,0 +1,9 @@
+import { Router } from 'express';
+import { requireAuth } from '../middleware/auth';
+import { deleteCase } from '../controllers/case.controller';
+
+const router = Router();
+
+router.delete('/:caseId', requireAuth, deleteCase);
+
+export default router;

src/routes/index.ts

@@ -2,6 +2,7 @@ import { Router } from 'express';
 import documentRoutes from './document.routes';
 import chatRoutes from './chat.routes';
 import precedentRoutes from './precedent.routes';
+import caseRoutes from './case.routes';
 
 const router = Router();
 
@@ -11,6 +12,7 @@ router.get('/health', (req, res) => {
 
 router.use('/documents', documentRoutes);
 router.use('/chat', chatRoutes);
+router.use('/cases', caseRoutes);
 router.use('/', precedentRoutes); // Keeps the same paths like /api/search-precedents
 
 export default router;