Make freeze/mirror rejection message actionable; tighten test

Point the caller to the direct image reference in the NotFoundException
message, and assert the message carries that reference in the test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: pditommaso

src/main/groovy/io/seqera/wave/core/RouteHandler.groovy

@@ -66,7 +66,7 @@ class RouteHandler {
             // meant to be pulled directly from there - they must not be served via the Wave
             // proxy token path (see also ContainerRequest.durable)
             if( request.durable() ) {
-                throw new NotFoundException("Wave container for token '$token' is not available via the proxy")
+                throw new NotFoundException("Container '$token' is a freeze/mirror image and must be pulled directly from '${request.containerImage}'")
             }
             // the image name (without tag) must match
             final coords = request.coordinates()

src/test/groovy/io/seqera/wave/core/RouteHandlerTest.groovy

@@ -143,12 +143,14 @@ class RouteHandlerTest extends Specification {
         then:
         1 * tokenService.getRequest(TOKEN) >> REQUEST
         and:
-        thrown(NotFoundException)
+        def e = thrown(NotFoundException)
+        // the error must point the caller to the direct image reference
+        e.message.contains(IMAGE)
 
         where:
-        REQ_PATH                                      | TOKEN | REQUEST
-        '/v2/wt/a1/library/ubuntu/manifests/latest'   | 'a1'  | ContainerRequest.of(containerImage: 'ubuntu:latest', freeze: true)
-        '/v2/wt/b2/library/ubuntu/blobs/latest'       | 'b2'  | ContainerRequest.of(containerImage: 'ubuntu:latest', type: ContainerRequest.Type.Mirror)
+        REQ_PATH                                      | TOKEN | IMAGE                       | REQUEST
+        '/v2/wt/a1/library/ubuntu/manifests/latest'   | 'a1'  | 'quay.io/org/ubuntu:1.0'    | ContainerRequest.of(containerImage: 'quay.io/org/ubuntu:1.0', freeze: true)
+        '/v2/wt/b2/library/ubuntu/blobs/latest'       | 'b2'  | 'quay.io/org/ubuntu:1.0'    | ContainerRequest.of(containerImage: 'quay.io/org/ubuntu:1.0', type: ContainerRequest.Type.Mirror)
     }
 
 }