refactor(main): delegate setup to config, store, and web packages

Replace in-file bootstrap logic with package-level constructors in `run`:
- use `config.Load()` instead of local env parsing/AppConfig helpers
- use `store.Open()` and `web.New()` for persistence and app wiring
- rename local store variable to `benchmarkStore` for clarity

This centralizes startup concerns in dedicated modules, reducing `main.go` boilerplate and improving maintainability.refactor(main): delegate setup to config, store, and web packages

Replace in-file bootstrap logic with package-level constructors in `run`:
- use `config.Load()` instead of local env parsing/AppConfig helpers
- use `store.Open()` and `web.New()` for persistence and app wiring
- rename local store variable to `benchmarkStore` for clarity

This centralizes startup concerns in dedicated modules, reducing `main.go` boilerplate and improving maintainability.

main.go

@@ -2,24 +2,19 @@ package main
 
 import (
 	"context"
+	"cpu-benchmark-server/lib/config"
+	"cpu-benchmark-server/lib/store"
+	"cpu-benchmark-server/lib/web"
 	"errors"
 	"log"
 	"net/http"
 	"os"
 	"os/signal"
-	"strconv"
 	"sync"
 	"syscall"
 	"time"
 )
 
-type AppConfig struct {
-	Addr            string
-	BadgerDir       string
-	PageSize        int
-	ShutdownTimeout time.Duration
-}
-
 func main() {
 	logger := log.New(os.Stdout, "", log.LstdFlags|log.LUTC)
 	if err := run(logger); err != nil {
@@ -29,26 +24,26 @@ func main() {
 }
 
 func run(logger *log.Logger) error {
-	cfg := loadConfig()
+	cfg := config.Load()
 
 	if err := os.MkdirAll(cfg.BadgerDir, 0o755); err != nil {
 		return err
 	}
 
-	store, err := OpenStore(cfg.BadgerDir)
+	benchmarkStore, err := store.Open(cfg.BadgerDir)
 	if err != nil {
 		return err
 	}
 
 	var closeOnce sync.Once
 	closeStore := func() {
-		if err := store.Close(); err != nil {
+		if err := benchmarkStore.Close(); err != nil {
 			logger.Printf("close store: %v", err)
 		}
 	}
 	defer closeOnce.Do(closeStore)
 
-	app, err := NewApp(store, cfg.PageSize)
+	app, err := web.New(benchmarkStore, cfg.PageSize)
 	if err != nil {
 		return err
 	}
@@ -88,48 +83,3 @@ func run(logger *log.Logger) error {
 
 	return nil
 }
-
-func loadConfig() AppConfig {
-	return AppConfig{
-		Addr:            envOrDefault("APP_ADDR", ":8080"),
-		BadgerDir:       envOrDefault("BADGER_DIR", "data/badger"),
-		PageSize:        envIntOrDefault("PAGE_SIZE", 50),
-		ShutdownTimeout: envDurationOrDefault("SHUTDOWN_TIMEOUT", 10*time.Second),
-	}
-}
-
-func envOrDefault(key, fallback string) string {
-	if value := os.Getenv(key); value != "" {
-		return value
-	}
-
-	return fallback
-}
-
-func envIntOrDefault(key string, fallback int) int {
-	value := os.Getenv(key)
-	if value == "" {
-		return fallback
-	}
-
-	parsed, err := strconv.Atoi(value)
-	if err != nil || parsed <= 0 {
-		return fallback
-	}
-
-	return parsed
-}
-
-func envDurationOrDefault(key string, fallback time.Duration) time.Duration {
-	value := os.Getenv(key)
-	if value == "" {
-		return fallback
-	}
-
-	parsed, err := time.ParseDuration(value)
-	if err != nil || parsed <= 0 {
-		return fallback
-	}
-
-	return parsed
-}