chore: defer Sourcery auth; continue work

backend/internal/models/setting.go

@@ -0,0 +1,16 @@
+package models
+
+import (
+	"time"
+)
+
+// Setting stores global application configuration as key-value pairs.
+// Used for system-wide preferences, feature flags, and runtime config.
+type Setting struct {
+	ID        uint      `json:"id" gorm:"primaryKey"`
+	Key       string    `json:"key" gorm:"uniqueIndex"`
+	Value     string    `json:"value" gorm:"type:text"`
+	Type      string    `json:"type"`     // "string", "int", "bool", "json"
+	Category  string    `json:"category"` // "general", "security", "caddy", "smtp", etc.
+	UpdatedAt time.Time `json:"updated_at"`
+}