fix(tests): load JIT compiler before router imports in seo.service.spec

The PlatformLocation static initializer in @angular/common/router
requires @angular/compiler to be loaded first. Move the compiler
import before any Angular router/common imports so the JIT facade
is available when the module loads.

src/app/services/seo.service.spec.ts

@@ -1,3 +1,7 @@
+// Load the JIT compiler BEFORE any Angular router/common imports so that
+// injectables like PlatformLocation can be instantiated without TestBed.
+import '@angular/compiler';
+
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { Subject } from 'rxjs';
 import { NavigationEnd } from '@angular/router';