feat: extend equipment and workout models with service tracking

internal/workout/handler.go

@@ -45,6 +45,7 @@ func (h *Handler) CreateWorkout(w http.ResponseWriter, r *http.Request) {
 		Notes        string           `json:"notes"`
 		WorkoutData  *WorkoutDataJSON `json:"workout_data"`
 		FileType     string           `json:"file_type"`
+		EquipmentID  *uint            `json:"equipment_id"`
 	}
 
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -106,6 +107,7 @@ func (h *Handler) CreateWorkout(w http.ResponseWriter, r *http.Request) {
 		Notes:         req.Notes,
 		FileType:      req.FileType,
 		WorkoutData:   *workoutData,
+		EquipmentID:   req.EquipmentID,
 	}
 
 	log.Printf("Creating workout: %+v", workout)
@@ -211,6 +213,7 @@ func (h *Handler) UpdateWorkout(w http.ResponseWriter, r *http.Request) {
 		MaxHR          int     `json:"max_hr"`
 		CaloriesBurned int     `json:"calories_burned"`
 		Notes          string  `json:"notes"`
+		EquipmentID    *uint   `json:"equipment_id"`
 	}
 
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -267,6 +270,9 @@ func (h *Handler) UpdateWorkout(w http.ResponseWriter, r *http.Request) {
 	if req.Notes != "" {
 		workout.Notes = req.Notes
 	}
+	if req.EquipmentID != nil {
+		workout.EquipmentID = req.EquipmentID
+	}
 
 	if err := h.service.repo.UpdateWorkout(workout); err != nil {
 		w.Header().Set("Content-Type", "application/json")
@@ -320,6 +326,26 @@ func (h *Handler) GetWorkoutTypes(w http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(w).Encode(types)
 }
 
+// GetEquipmentStats GET /api/protected/workouts/equipment-stats
+func (h *Handler) GetEquipmentStats(w http.ResponseWriter, r *http.Request) {
+	claims := r.Context().Value(middleware.UserContextKey).(*config.CustomClaims)
+
+	stats, err := h.service.GetEquipmentStats(claims.UserID)
+	if err != nil {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusInternalServerError)
+		json.NewEncoder(w).Encode(map[string]string{"error": "failed to fetch equipment stats"})
+		return
+	}
+
+	if stats == nil {
+		stats = []EquipmentStat{}
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(stats)
+}
+
 // UploadWorkoutFile POST /api/protected/workouts/upload
 func (h *Handler) UploadWorkoutFile(w http.ResponseWriter, r *http.Request) {
 	claims := r.Context().Value(middleware.UserContextKey).(*config.CustomClaims)