Refactor configuration management by migrating to a modular config system

- Removed the old `infra.Config` structure and replaced it with a new modular configuration system in `pkg/config`.
- Introduced a `Config` struct in `cmd/web/config.go` to hold command-specific configurations.
- Updated configuration loading functions to utilize the new `LoadConfig` method with generics for type safety.
- Adjusted various initialization functions in `cmd/web/bootstrap.go` and `cmd/web/main.go` to reflect the new configuration structure.
- Cleaned up the `config.yaml` by removing obsolete fields and ensuring it aligns with the new configuration schema.

pkg/config/config.go

@@ -0,0 +1,79 @@
+package config
+
+import (
+	"time"
+
+	"github.com/spf13/viper"
+)
+
+type ServerConfig struct {
+	Host         string        `mapstructure:"host"`
+	Port         int           `mapstructure:"port"`
+	Timeout      time.Duration `mapstructure:"timeout"`
+	ReadTimeout  time.Duration `mapstructure:"read_timeout"`
+	WriteTimeout time.Duration `mapstructure:"write_timeout"`
+}
+
+type DatabaseConfig struct {
+	MongoDB MongoConfig `mapstructure:"mongodb"`
+}
+
+type MongoConfig struct {
+	URI         string        `mapstructure:"uri"`
+	Name        string        `mapstructure:"name"`
+	Timeout     time.Duration `mapstructure:"timeout"`
+	MaxPoolSize int           `mapstructure:"max_pool_size"`
+}
+
+type CacheConfig struct {
+	Redis RedisConfig `mapstructure:"redis"`
+}
+
+type RedisConfig struct {
+	Host     string `mapstructure:"host"`
+	Port     int    `mapstructure:"port"`
+	Password string `mapstructure:"password"`
+	DB       int    `mapstructure:"db"`
+	PoolSize int    `mapstructure:"pool_size"`
+}
+
+type LoggingConfig struct {
+	Level  string        `mapstructure:"level"`
+	Format string        `mapstructure:"format"`
+	Output string        `mapstructure:"output"`
+	File   LogFileConfig `mapstructure:"file"`
+}
+
+type LogFileConfig struct {
+	Path       string `mapstructure:"path"`
+	MaxSize    int    `mapstructure:"max_size"` // MB
+	MaxBackups int    `mapstructure:"max_backups"`
+	MaxAge     int    `mapstructure:"max_age"` // days
+	Compress   bool   `mapstructure:"compress"`
+}
+
+type RateLimitConfig struct {
+	RequestsPerMinute int `mapstructure:"requests_per_minute"`
+	Burst             int `mapstructure:"burst"`
+}
+
+// LoadConfig loads configuration from file and environment variables
+func LoadConfig[T any](path string, config T) (T, error) {
+	viper.SetConfigName("config")
+	viper.SetConfigType("yaml")
+	viper.AddConfigPath(path)
+
+	// Enable reading from environment variables
+	viper.AutomaticEnv()
+
+	// Read configuration file
+	if err := viper.ReadInConfig(); err != nil {
+		return config, err
+	}
+
+	if err := viper.Unmarshal(config); err != nil {
+		return config, err
+	}
+
+	return config, nil
+}