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>

app/templates/partials/volume_chart.html

@@ -0,0 +1,30 @@
+<canvas id="volume-chart" style="max-height:300px;"></canvas>
+<script>
+(function() {
+    var data = {{ volume_data_json|safe }};
+    var labels = Object.keys(data);
+    var values = Object.values(data);
+
+    new Chart(document.getElementById('volume-chart'), {
+        type: 'bar',
+        data: {
+            labels: labels,
+            datasets: [{
+                label: 'Total Volume (lbs)',
+                data: values,
+                backgroundColor: 'rgba(99, 102, 241, 0.7)',
+                borderColor: 'rgba(99, 102, 241, 1)',
+                borderWidth: 1
+            }]
+        },
+        options: {
+            responsive: true,
+            plugins: { legend: { display: false } },
+            scales: {
+                y: { beginAtZero: true, ticks: { color: '#ccc' } },
+                x: { ticks: { color: '#ccc' } }
+            }
+        }
+    });
+})();
+</script>