feat: add test framework, unit tests, and GitLab CI pipeline

- Add pytest config in backend/pyproject.toml with asyncio mode and coverage
- Add backend/requirements-test.txt with pytest, pytest-cov, pytest-asyncio, aiosqlite
- Write 86 backend unit tests covering auth (JWT tokens), schemas (Pydantic
  models), config (Settings env overrides), log_parser (log parsing, IP
  resolution, geo data), models (SQLAlchemy table definitions + column
  defaults), and theme export
- Add Vitest config for Angular frontend (vitest.config.ts, src/test-setup.ts)
- Add .gitlab-ci.yml with stages: backend-test, frontend-test, backend-lint,
  docker-build, and quality-gate
- CI enforces 10% minimum coverage threshold for backend

backend/tests/test_schemas.py

@@ -0,0 +1,177 @@
+"""Tests for Pydantic schemas — validation, defaults, and computed fields."""
+
+from datetime import date
+import pytest
+
+from app.schemas import (
+    EventCreate,
+    EventUpdate,
+    EventResponse,
+    StationConfigUpdate,
+    ShowScheduleResponse,
+    ShowCreate,
+    ShowScheduleCreate,
+    HistoryEntryCreate,
+    TeamMemberCreate,
+    UnderwriterCreate,
+    DAY_NAMES,
+)
+
+
+class TestEventSchemas:
+    """Tests for Event Pydantic schemas."""
+
+    def test_event_create_validates_required_fields(self):
+        event = EventCreate(
+            date=date(2026, 8, 15),
+            title="Summer Concert",
+            description="Live music",
+            location="Main Stage",
+            icon="🎵",
+        )
+        assert event.title == "Summer Concert"
+        assert event.rsvp_url is None
+
+    def test_event_create_with_rsvp(self):
+        event = EventCreate(
+            date=date(2026, 9, 1),
+            title="Festival",
+            description="Big event",
+            location="Park",
+            icon="🎉",
+            rsvp_url="https://example.com/rsvp",
+        )
+        assert event.rsvp_url == "https://example.com/rsvp"
+
+    def test_event_update_all_optional(self):
+        update = EventUpdate()
+        assert update.title is None
+        assert update.active is None
+
+    def test_event_update_partial(self):
+        update = EventUpdate(active=False, title="Updated Title")
+        assert update.active is False
+        assert update.title == "Updated Title"
+        assert update.date is None
+
+
+class TestStationConfigUpdate:
+    """Tests for StationConfigUpdate schema."""
+
+    def test_all_fields_optional(self):
+        update = StationConfigUpdate()
+        assert update.callsign is None
+        assert update.color_primary is None
+
+    def test_partial_update(self):
+        update = StationConfigUpdate(
+            callsign="KXYZ",
+            color_primary="#ff0000",
+        )
+        assert update.callsign == "KXYZ"
+        assert update.color_primary == "#ff0000"
+        assert update.name_primary is None
+
+
+class TestShowScheduleResponse:
+    """Tests for ShowScheduleResponse computed field."""
+
+    def test_day_label_mapping(self):
+        for day_num, expected_label in DAY_NAMES.items():
+            schedule = ShowScheduleResponse(
+                id=1,
+                show_id=1,
+                day_of_week=day_num,
+                time="10:00",
+            )
+            assert schedule.day_label == expected_label
+
+    def test_unknown_day_returns_unknown(self):
+        schedule = ShowScheduleResponse(
+            id=1,
+            show_id=1,
+            day_of_week=99,
+            time="10:00",
+        )
+        assert schedule.day_label == "Unknown"
+
+
+class TestShowCreate:
+    """Tests for ShowCreate schema."""
+
+    def test_show_create_with_schedules(self):
+        show = ShowCreate(
+            title="Morning Show",
+            description="Morning music",
+            host="DJ Alex",
+            genre="Pop",
+            schedules=[
+                ShowScheduleCreate(day_of_week=1, time="08:00"),
+                ShowScheduleCreate(day_of_week=3, time="08:00"),
+            ],
+        )
+        assert len(show.schedules) == 2
+        assert show.schedules[0].day_of_week == 1
+        assert show.display_order == 0
+
+    def test_show_create_defaults(self):
+        show = ShowCreate(
+            title="Show",
+            description="Desc",
+            host="Host",
+            genre="Genre",
+            schedules=[ShowScheduleCreate(day_of_week=1, time="09:00")],
+        )
+        assert show.show_art_url is None
+        assert show.hero_image_url is None
+        assert show.display_order == 0
+
+
+class TestHistoryEntryCreate:
+    """Tests for HistoryEntryCreate schema."""
+
+    def test_valid_creation(self):
+        entry = HistoryEntryCreate(
+            year=1987,
+            title="Station Founded",
+            body="The station began broadcasting.",
+            display_order=1,
+        )
+        assert entry.year == 1987
+        assert entry.title == "Station Founded"
+
+
+class TestTeamMemberCreate:
+    """Tests for TeamMemberCreate schema."""
+
+    def test_required_fields(self):
+        member = TeamMemberCreate(
+            name="Jane Doe",
+            title="Engineer",
+            display_order=1,
+        )
+        assert member.name == "Jane Doe"
+        assert member.bio is None
+        assert member.photo_url is None
+
+
+class TestUnderwriterCreate:
+    """Tests for UnderwriterCreate schema."""
+
+    def test_defaults_display_order_to_zero(self):
+        uw = UnderwriterCreate(
+            name="Sponsor Co",
+            description="A great sponsor",
+        )
+        assert uw.display_order == 0
+        assert uw.website_url is None
+        assert uw.logo_url is None
+
+    def test_custom_display_order(self):
+        uw = UnderwriterCreate(
+            name="Premium Sponsor",
+            description="Best sponsor",
+            display_order=5,
+            website_url="https://sponsor.example.com",
+        )
+        assert uw.display_order == 5