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/exercise_card.html

@@ -19,6 +19,11 @@
     </div>
     {% endif %}
 
+    {% if suggestions and suggestions[exercise.id] %}
+        {% set suggestion = suggestions[exercise.id] %}
+        {% include "partials/progression_badge.html" %}
+    {% endif %}
+
     <details>
         <summary>Form Cues</summary>
         <p>{{ exercise.form_cues }}</p>