Rename smartrun to geniusrun throughout the codebase

Updates the Go module path, cmd/smartrund -> cmd/geniusrund, the
smartrun-dev skill, .gitignore, and every reference in docs/CLAUDE.md
to match.

backend/internal/sync/mapping.go

@@ -5,9 +5,9 @@ import (
 	"strings"
 	"time"
 
-	"smartrun/backend/internal/classify"
-	"smartrun/backend/internal/garmin"
-	"smartrun/backend/internal/store"
+	"geniusrun/backend/internal/classify"
+	"geniusrun/backend/internal/garmin"
+	"geniusrun/backend/internal/store"
 )
 
 // isRunningActivityType reports whether a Garmin activityType.typeKey

backend/internal/sync/service.go

@@ -12,9 +12,9 @@ import (
 	"sync"
 	"time"
 
-	"smartrun/backend/internal/classify"
-	"smartrun/backend/internal/garmin"
-	"smartrun/backend/internal/store"
+	"geniusrun/backend/internal/classify"
+	"geniusrun/backend/internal/garmin"
+	"geniusrun/backend/internal/store"
 )
 
 // Config tunes sync behavior. Zero values fall back to sensible defaults in

backend/internal/sync/service_test.go

@@ -6,17 +6,17 @@ import (
 	"testing"
 	"time"
 
-	"smartrun/backend/internal/classify"
-	"smartrun/backend/internal/garmin"
-	"smartrun/backend/internal/garmin/mock"
-	"smartrun/backend/internal/store"
+	"geniusrun/backend/internal/classify"
+	"geniusrun/backend/internal/garmin"
+	"geniusrun/backend/internal/garmin/mock"
+	"geniusrun/backend/internal/store"
 )
 
 func f(v float64) *float64 { return &v }
 
 func openTestDB(t *testing.T) *store.DB {
 	t.Helper()
-	db, err := store.Open(filepath.Join(t.TempDir(), "smartrun_test.db"))
+	db, err := store.Open(filepath.Join(t.TempDir(), "geniusrun_test.db"))
 	if err != nil {
 		t.Fatalf("store.Open: %v", err)
 	}