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/routes/workouts.py

@@ -16,6 +16,7 @@ from app.models.user import User
 from app.models.user_exercise_program import UserExerciseProgram
 from app.services.exercise_service import ExerciseService
 from app.services.log_service import LogService
+from app.services.progression_service import ProgressionService
 from app.services.workout_session_service import WorkoutSessionService
 from app.utils.auth import get_current_admin_user, get_active_profile_id
 
@@ -99,6 +100,15 @@ async def workout_day_detail(
             workout_day_id = d.id
             break
 
+    # Get progression suggestions for each exercise
+    suggestions = {}
+    if active_profile_id:
+        progression = ProgressionService(session)
+        for exercise in exercises:
+            suggestions[exercise.id] = progression.get_suggestion(
+                active_profile_id, exercise.id,
+            )
+
     # Load existing logs for today's session (if any)
     if active_profile_id and workout_day_id:
         ws_service = WorkoutSessionService(session)
@@ -121,6 +131,7 @@ async def workout_day_detail(
         "programs": programs,
         "active_profile": active_profile,
         "existing_logs": existing_logs,
+        "suggestions": suggestions,
         "workout_day_id": workout_day_id,
         "admin": admin,
     })