Test dashboard: full menu system, all-service tests, filtering

- Run tests for all 10 services via per-service pytest subprocesses
- Group results by service with section headers
- Clickable summary cards filter by outcome (passed/failed/errors/skipped)
- Service filter nav using ~nav-link buttons in menu bar
- Full menu integration: ~header-row + ~header-child + ~menu-row
- Show logo image via cart-mini rendering
- Mount full service directories in docker-compose for test access
- Add 24 unit test files across 9 services

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

relations/tests/test_serialize.py

@@ -0,0 +1,66 @@
+"""Unit tests for relations serialization."""
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+import pytest
+
+from relations.bp.data.routes import _serialize_rel
+
+
+class TestSerializeRel:
+    def test_all_fields(self):
+        rel = SimpleNamespace(
+            id=1,
+            parent_type="page",
+            parent_id=100,
+            child_type="calendar",
+            child_id=200,
+            sort_order=0,
+            label="Main Calendar",
+            relation_type="container",
+            metadata_={"key": "val"},
+        )
+        result = _serialize_rel(rel)
+        assert result == {
+            "id": 1,
+            "parent_type": "page",
+            "parent_id": 100,
+            "child_type": "calendar",
+            "child_id": 200,
+            "sort_order": 0,
+            "label": "Main Calendar",
+            "relation_type": "container",
+            "metadata": {"key": "val"},
+        }
+
+    def test_none_optionals(self):
+        rel = SimpleNamespace(
+            id=2,
+            parent_type="post",
+            parent_id=1,
+            child_type="market",
+            child_id=1,
+            sort_order=1,
+            label=None,
+            relation_type=None,
+            metadata_=None,
+        )
+        result = _serialize_rel(rel)
+        assert result["label"] is None
+        assert result["relation_type"] is None
+        assert result["metadata"] is None
+
+    def test_dict_structure(self):
+        rel = SimpleNamespace(
+            id=3, parent_type="a", parent_id=1,
+            child_type="b", child_id=2,
+            sort_order=0, label="", relation_type="link",
+            metadata_={},
+        )
+        result = _serialize_rel(rel)
+        assert set(result.keys()) == {
+            "id", "parent_type", "parent_id",
+            "child_type", "child_id", "sort_order",
+            "label", "relation_type", "metadata",
+        }