fix: add mapstructure tags to config structs for proper viper parsing

internal/config/config.go

@@ -8,48 +8,48 @@ import (
 )
 
 type Config struct {
-	Server   ServerConfig
-	Database DatabaseConfig
-	Redis    RedisConfig
-	JWT      JWTConfig
-	Captcha  CaptchaConfig
+	Server   ServerConfig   `mapstructure:"server"`
+	Database DatabaseConfig `mapstructure:"database"`
+	Redis    RedisConfig    `mapstructure:"redis"`
+	JWT      JWTConfig      `mapstructure:"jwt"`
+	Captcha  CaptchaConfig  `mapstructure:"captcha"`
 }
 
 type ServerConfig struct {
-	Host string
-	Port int
-	Mode string
+	Host string `mapstructure:"host"`
+	Port int    `mapstructure:"port"`
+	Mode string `mapstructure:"mode"`
 }
 
 type DatabaseConfig struct {
-	Type     string // sqlite or mysql
-	Host     string
-	Port     int
-	User     string
-	Password string
-	Database string
-	SQLite   SQLiteConfig
+	Type     string       `mapstructure:"type"`     // sqlite or mysql
+	Host     string       `mapstructure:"host"`
+	Port     int          `mapstructure:"port"`
+	User     string       `mapstructure:"user"`
+	Password string       `mapstructure:"password"`
+	Database string       `mapstructure:"database"`
+	SQLite   SQLiteConfig `mapstructure:"sqlite"`
 }
 
 type SQLiteConfig struct {
-	Path string
+	Path string `mapstructure:"path"`
 }
 
 type RedisConfig struct {
-	Enabled  bool
-	Host     string
-	Port     int
-	Password string
-	DB       int
+	Enabled  bool   `mapstructure:"enabled"`
+	Host     string `mapstructure:"host"`
+	Port     int    `mapstructure:"port"`
+	Password string `mapstructure:"password"`
+	DB       int    `mapstructure:"db"`
 }
 
 type JWTConfig struct {
-	Secret     string
-	ExpireTime int // hours
+	Secret     string `mapstructure:"secret"`
+	ExpireTime int    `mapstructure:"expire_time"` // hours
 }
 
 type CaptchaConfig struct {
-	ModelPath string
+	ModelPath string `mapstructure:"model_path"`
 }
 
 var Cfg *Config