add initial application structure with configuration, logging, and health check endpoints

internal/config/config.go

@@ -0,0 +1,62 @@
+package config
+
+import (
+	"fmt"
+
+	"github.com/spf13/viper"
+)
+
+type Config struct {
+	Server ServerConfig `mapstructure:"server"`
+	MySQL  MySQLConfig  `mapstructure:"mysql"`
+	Redis  RedisConfig  `mapstructure:"redis"`
+	Log    LogConfig    `mapstructure:"log"`
+	Cron   CronConfig   `mapstructure:"cron"`
+}
+
+type ServerConfig struct {
+	Port         int    `mapstructure:"port"`
+	ReadTimeout  string `mapstructure:"readTimeout"`
+	WriteTimeout string `mapstructure:"writeTimeout"`
+}
+
+type MySQLConfig struct {
+	DSN string `mapstructure:"dsn"`
+}
+
+type RedisConfig struct {
+	Addr     string `mapstructure:"addr"`
+	Password string `mapstructure:"password"`
+	DB       int    `mapstructure:"db"`
+}
+
+type LogConfig struct {
+	Level  string `mapstructure:"level"`
+	Format string `mapstructure:"format"`
+}
+
+type CronConfig struct {
+	Enabled  bool   `mapstructure:"enabled"`
+	Timezone string `mapstructure:"timezone"`
+}
+
+func Load() (*Config, error) {
+	v := viper.New()
+	v.SetConfigName("application")
+	v.SetConfigType("yaml")
+	v.AddConfigPath(".")
+
+	v.SetEnvPrefix("APP")
+	v.AutomaticEnv()
+
+	if err := v.ReadInConfig(); err != nil {
+		return nil, fmt.Errorf("read config: %w", err)
+	}
+
+	var cfg Config
+	if err := v.Unmarshal(&cfg); err != nil {
+		return nil, fmt.Errorf("unmarshal config: %w", err)
+	}
+
+	return &cfg, nil
+}

internal/config/module.go

@@ -0,0 +1,7 @@
+package config
+
+import "go.uber.org/fx"
+
+var Module = fx.Options(
+	fx.Provide(Load),
+)