feat: add Phase 5 Progression & Analytics — smart suggestions, dashboard, schedule

Add auto-progression engine (ProgressionService) with rep increase, weight
increase, deload, and felt-easy acceleration rules. Add AnalyticsService for
user stats, exercise progress charts, and volume-by-day data. New dashboard
and schedule routes with Chart.js visualizations. Progression badges shown
inline on workout day view. Navigation updated with Dashboard and Schedule links.

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

tests/test_schedule_routes.py

@@ -0,0 +1,12 @@
+"""Tests for schedule calendar routes."""
+
+from fastapi.testclient import TestClient
+
+
+class TestSchedule:
+    """Tests for GET /schedule."""
+
+    def test_schedule_requires_auth(self, client: TestClient) -> None:
+        """GET /schedule should require admin login."""
+        response = client.get("/schedule", follow_redirects=False)
+        assert response.status_code in (401, 303)