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_models.py

@@ -0,0 +1,111 @@
+"""Tests for app.models — SQLAlchemy model definitions and relationships."""
+
+import pytest
+
+from app.models import (
+    Base,
+    Show,
+    ShowSchedule,
+    Event,
+    StationConfig,
+    HistoryEntry,
+    TeamMember,
+    CommunityHighlight,
+    Underwriter,
+    VisitorStatDaily,
+    VisitorStatGeo,
+)
+
+
+class TestModelDefinitions:
+    """Verify that models are properly defined."""
+
+    def test_show_table_name(self):
+        assert Show.__tablename__ == "shows"
+
+    def test_show_schedule_table_name(self):
+        assert ShowSchedule.__tablename__ == "show_schedules"
+
+    def test_event_table_name(self):
+        assert Event.__tablename__ == "events"
+
+    def test_station_config_table_name(self):
+        assert StationConfig.__tablename__ == "station_config"
+
+    def test_history_entry_table_name(self):
+        assert HistoryEntry.__tablename__ == "history_entries"
+
+    def test_team_member_table_name(self):
+        assert TeamMember.__tablename__ == "team_members"
+
+    def test_community_highlight_table_name(self):
+        assert CommunityHighlight.__tablename__ == "community_highlights"
+
+    def test_underwriter_table_name(self):
+        assert Underwriter.__tablename__ == "underwriters"
+
+    def test_visitor_stats_daily_table_name(self):
+        assert VisitorStatDaily.__tablename__ == "visitor_stats_daily"
+
+    def test_visitor_stats_geo_table_name(self):
+        assert VisitorStatGeo.__tablename__ == "visitor_stats_geo"
+
+
+class TestModelDefaults:
+    """Verify SQLAlchemy column-level defaults (set at INSERT time)."""
+
+    def _col_default_value(self, model_cls, col_name):
+        """Extract the Column default value from a model's metadata."""
+        col = model_cls.__table__.columns[col_name]
+        default = col.default
+        if default is None:
+            return None
+        # DefaultClause.arg is a property (not callable) in SQLAlchemy 2.0
+        if hasattr(default, "arg"):
+            return default.arg
+        return default
+
+    def test_show_defaults(self):
+        assert self._col_default_value(Show, "display_order") == 0
+        assert self._col_default_value(Show, "active") is True
+
+    def test_event_defaults(self):
+        assert self._col_default_value(Event, "active") is True
+
+    def test_station_config_defaults(self):
+        assert self._col_default_value(StationConfig, "callsign") == "KMTN"
+        assert self._col_default_value(StationConfig, "name_primary") == "KMountain"
+        assert self._col_default_value(StationConfig, "name_secondary") == "Flower Radio"
+        assert self._col_default_value(StationConfig, "frequency") == "98.7 FM"
+        assert self._col_default_value(StationConfig, "founded_year") == 1987
+        assert self._col_default_value(StationConfig, "nonprofit_type") == "501(c)(3)"
+
+    def test_history_entry_defaults(self):
+        assert self._col_default_value(HistoryEntry, "active") is True
+
+    def test_team_member_defaults(self):
+        assert self._col_default_value(TeamMember, "active") is True
+
+    def test_underwriter_defaults(self):
+        assert self._col_default_value(Underwriter, "display_order") == 0
+        assert self._col_default_value(Underwriter, "active") is True
+
+
+class TestBaseModel:
+    """Verify Base declarative model setup."""
+
+    def test_base_has_metadata(self):
+        assert hasattr(Base, "metadata")
+
+    def test_all_models_registered_in_metadata(self):
+        tables = Base.metadata.tables
+        assert "shows" in tables
+        assert "show_schedules" in tables
+        assert "events" in tables
+        assert "station_config" in tables
+        assert "history_entries" in tables
+        assert "team_members" in tables
+        assert "community_highlights" in tables
+        assert "underwriters" in tables
+        assert "visitor_stats_daily" in tables
+        assert "visitor_stats_geo" in tables