fix: [영업관리] codebridge DB 테이블 exists 검증 오류 수정

- tenant_prospects, tenants, sales_products 등이 codebridge DB에 있으므로
  exists:테이블명 → exists:codebridge.테이블명 으로 변경
- SalesScenarioController, SalesContractController, ConsultationController,
  SalesProductController 일괄 수정

app/Http/Controllers/Sales/SalesScenarioController.php

@@ -114,7 +114,7 @@ public function managerScenario(int $tenantId, Request $request): View|Response
     public function toggleChecklist(Request $request): JsonResponse
     {
         $request->validate([
-            'tenant_id' => 'required|integer|exists:tenants,id',
+            'tenant_id' => 'required|integer|exists:codebridge.tenants,id',
             'scenario_type' => 'required|in:sales,manager',
             'step_id' => 'required|integer',
             'checkpoint_id' => 'required|string',
@@ -274,7 +274,7 @@ public function prospectManagerScenario(int $prospectId, Request $request): View
     public function toggleProspectChecklist(Request $request): JsonResponse
     {
         $request->validate([
-            'prospect_id' => 'required|integer|exists:tenant_prospects,id',
+            'prospect_id' => 'required|integer|exists:codebridge.tenant_prospects,id',
             'scenario_type' => 'required|in:sales,manager',
             'step_id' => 'required|integer',
             'checkpoint_id' => 'required|string',