fix: resolve go vet error and dayStart logic in ComputeDailyTotals

- Fix 'string(d)' int-to-rune conversion in rpg_test.go by using fmt.Sprintf
- Fix ComputeDailyTotals dayStart logic: initial state should be StateWorking
  when dayStart > 0, correctly counting work from dayStart to first out event
- Update README project structure to reflect new domain/handler/repo layout
- Implement missing achievements: rpg_pioneer (on RPG enable) and
  salary_setter (on first rate set)
- Add tryUnlockAchievement helper to Handler

cmd/bot/main.go

@@ -14,8 +14,8 @@ import (
 	"github.com/go-telegram/bot/models"
 	"github.com/joho/godotenv"
 
-	"worktimeBot/internal/bot"
-	"worktimeBot/internal/db"
+	"worktimeBot/internal/handler"
+	"worktimeBot/internal/repo"
 )
 
 func main() {
@@ -23,12 +23,13 @@ func main() {
 		AddSource: true,
 		Level:     slog.LevelInfo,
 	})))
+
 	godotenv.Load()
 
 	token := os.Getenv("BOT_TOKEN")
 	dbPath := getEnvDefault("DB_PATH", "db.sqlite3")
 
-	dbStore, err := db.NewStore(dbPath)
+	store, err := repo.NewStore(dbPath)
 	if err != nil {
 		slog.Error("failed to open database", "path", dbPath, "error", err)
 		os.Exit(1)
@@ -36,7 +37,7 @@ func main() {
 
 	allowedUsers := parseAllowedUsers(os.Getenv("BOT_ALLOWED_USERS"))
 
-	var h *bot.Handler
+	var h *handler.Handler
 
 	dispatch := func(ctx context.Context, b *tgbot.Bot, update *models.Update) {
 		if update.Message != nil {
@@ -53,7 +54,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	h = bot.NewHandler(b, dbStore, allowedUsers)
+	h = handler.NewHandler(b, store, allowedUsers)
 
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
 	defer cancel()
@@ -64,7 +65,7 @@ func main() {
 		if _, err := b.DeleteWebhook(ctx, &tgbot.DeleteWebhookParams{}); err != nil {
 			slog.Warn("failed to delete webhook", "error", err)
 		}
-		go dailyReportScheduler(ctx, h, dbStore)
+		go dailyReportScheduler(ctx, h, store)
 		slog.Info("bot started",
 			"allowed_users", len(allowedUsers),
 			"mode", "polling",
@@ -72,11 +73,11 @@ func main() {
 		b.Start(ctx)
 	}
 
-	dbStore.Close()
+	store.Close()
 }
 
 // dailyReportScheduler runs a periodic ticker that triggers daily report checks every 30 seconds.
-func dailyReportScheduler(ctx context.Context, h *bot.Handler, store *db.Store) {
+func dailyReportScheduler(ctx context.Context, h *handler.Handler, store repo.Repository) {
 	ticker := time.NewTicker(30 * time.Second)
 	defer ticker.Stop()
 
@@ -91,7 +92,7 @@ func dailyReportScheduler(ctx context.Context, h *bot.Handler, store *db.Store)
 }
 
 // checkDailyReports iterates all users and sends a daily report to those whose report time has arrived.
-func checkDailyReports(ctx context.Context, h *bot.Handler, store *db.Store) {
+func checkDailyReports(ctx context.Context, h *handler.Handler, store repo.Repository) {
 	users, err := store.GetAllUsers()
 	if err != nil {
 		slog.Error("report scheduler: get users", "error", err)
@@ -131,6 +132,7 @@ func checkDailyReports(ctx context.Context, h *bot.Handler, store *db.Store) {
 			"user_id", u.ID, "chat_id", u.ChatID, "timezone", u.Timezone,
 		)
 		h.SendDailyReport(ctx, u.ID, u.ChatID)
+		store.MarkReportSent(u.ID, today)
 	}
 }