Add unittests

.github/workflows/ci.yml

@@ -7,10 +7,28 @@ on:
   pull_request:
 
 jobs:
+  # ── Unit Tests ─────────────────────────────────────────────────────────────
+  unit-tests:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Run unit tests
+        run: dotnet test src/backend/tests/unit/Randall.Domain.UnitTests.csproj --logger "console;verbosity=normal"
+
   # ── E2E Tests ──────────────────────────────────────────────────────────────
   e2e:
     name: E2E Tests
     runs-on: ubuntu-latest
+    needs: unit-tests
 
     steps:
       - name: Checkout