feat: add service test page for individual VIN decode testing

Admin-only page at /dashboard/service-test with dropdown to test
each VIN decode service (Corgi, PartsCatalogs, PL24, EMEX, VIN API)
individually or the full cascade. Results shown as JSON on page,
no DB writes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/vehicles/vehicles.controller.ts

@@ -5,6 +5,7 @@ import { EmailService } from "../email/email.service";
 import { CurrentUser } from "../common/decorators/current-user.decorator";
 import { VinValidationPipe } from "../common/pipes/vin-validation.pipe";
 import { Public } from "../common/decorators/public.decorator";
+import { Roles } from "../common/decorators/roles.decorator";
 
 @Controller("vehicles")
 export class VehiclesController {
@@ -65,6 +66,15 @@ export class VehiclesController {
     return { sent: true };
   }
 
+  @Post("service-test")
+  @Roles("admin")
+  async serviceTest(
+    @Body("vin", VinValidationPipe) vin: string,
+    @Body("service") service?: string,
+  ) {
+    return this.vehiclesService.testService(vin, service);
+  }
+
   @Get(":vehicleId/prefetch-status")
   async prefetchStatus(
     @Param("vehicleId") vehicleId: string,

apps/api/src/vehicles/vehicles.service.ts

@@ -493,6 +493,76 @@ export class VehiclesService {
     return param?.value || null;
   }
 
+  /**
+   * Test a specific VIN decode service (or the full cascade).
+   * Admin-only — no DB writes, no brand access check, no user-vehicle link.
+   */
+  async testService(
+    vin: string,
+    service?: string,
+  ): Promise<{ service: string; success: boolean; responseTimeMs: number; data: any; error?: string }> {
+    const serviceName = service || "all";
+    const startTime = Date.now();
+
+    try {
+      let data: any = null;
+
+      switch (serviceName) {
+        case "corgi": {
+          data = this.corgiService.decodeVin(vin);
+          break;
+        }
+        case "parts-catalogs": {
+          data = await this.partsCatalogsService.decodeVin(vin);
+          break;
+        }
+        case "pl24": {
+          const isDecodeable = this.pl24Service.isDecodeable(vin);
+          if (!isDecodeable) {
+            return {
+              service: serviceName,
+              success: false,
+              responseTimeMs: Date.now() - startTime,
+              data: null,
+              error: `VIN WMI ${vin.substring(0, 3)} PL24 tarafından desteklenmiyor`,
+            };
+          }
+          data = await this.pl24Service.decodeVin(vin);
+          break;
+        }
+        case "emex": {
+          data = await this.emexService.decodeVinOrCandidates(vin);
+          break;
+        }
+        case "vin-api": {
+          data = await this.vinApiService.decodeVin(vin);
+          break;
+        }
+        case "all": {
+          data = await this.resolveVin(vin);
+          break;
+        }
+        default:
+          throw new BadRequestException(`Bilinmeyen servis: ${serviceName}`);
+      }
+
+      return {
+        service: serviceName,
+        success: data !== null,
+        responseTimeMs: Date.now() - startTime,
+        data,
+      };
+    } catch (err) {
+      return {
+        service: serviceName,
+        success: false,
+        responseTimeMs: Date.now() - startTime,
+        data: null,
+        error: (err as Error).message,
+      };
+    }
+  }
+
   /**
    * Get user's vehicle history via junction table.
    * Ordered by lastAccessedAt (most recent first).