Add CLI flags for setup and server configuration

- Add --setup flag to create admin user
- Add --admin-user and --admin-password for setup
- Generate cryptographically random passwords for --setup
- Add --bind and --port flags for server binding
- Add BIND env var support
- Add SMTP email service for password reset
- Add password reset token storage
- Add auth header to queue/logs frontend pages
- Fix journalctl timestamp format
- Fix logs to return empty array instead of error when no entries
- Fix queue handler to return proper error message
- Hide Users/Aliases nav links when no domain selected

backend/internal/config/config.go

@@ -12,6 +12,7 @@ type Config struct {
 	DBUser          string
 	DBPassword      string
 	DBName          string
+	Bind            string
 	Port            string
 	UseEmbedded     bool
 	JWTSecret       string
@@ -23,6 +24,12 @@ type Config struct {
 	DovecotQuotaCmd string
 	JournalctlPath  string
 	RspamdAPI       string
+	SMTPHost        string
+	SMTPPort        string
+	SMTPUser        string
+	SMTPPassword    string
+	SMTPFrom        string
+	BaseURL         string
 }
 
 func Load() *Config {
@@ -34,9 +41,10 @@ func Load() *Config {
 		DBUser:          getEnv("DB_USER", "mailadmin"),
 		DBPassword:      getEnv("DB_PASSWORD", ""),
 		DBName:          getEnv("DB_NAME", "mailserver"),
+		Bind:            getEnv("BIND", "0.0.0.0"),
 		Port:            getEnv("PORT", "8080"),
 		UseEmbedded:     getEnv("USE_EMBEDDED", "true") == "true",
-		JWTSecret:       getEnv("JWT_SECRET", "change-this-secret"),
+		JWTSecret:       getEnv("JWT_SECRET", "change-this-secret-in-production"),
 		AdminUser:       getEnv("ADMIN_USER", ""),
 		AdminPassword:   getEnv("ADMIN_PASSWORD", ""),
 		MailDataDir:     getEnv("MAIL_DATA_DIR", "/var/vmail"),
@@ -45,6 +53,12 @@ func Load() *Config {
 		DovecotQuotaCmd: getEnv("DOVECOT_QUOTA_CMD", "/usr/bin/doveadm"),
 		JournalctlPath:  getEnv("JOURNALCTL_PATH", "/usr/bin/journalctl"),
 		RspamdAPI:       getEnv("RSPAMD_API", "http://127.0.0.1:11334"),
+		SMTPHost:        getEnv("SMTP_HOST", "localhost"),
+		SMTPPort:        getEnv("SMTP_PORT", "587"),
+		SMTPUser:        getEnv("SMTP_USER", ""),
+		SMTPPassword:    getEnv("SMTP_PASSWORD", ""),
+		SMTPFrom:        getEnv("SMTP_FROM", "noreply@localhost"),
+		BaseURL:         getEnv("BASE_URL", "http://localhost:8080"),
 	}
 }