feat: migrate to golang

internal/model/config.go

@@ -0,0 +1,31 @@
+package model
+
+// Config is the user-editable application configuration
+// (ports to Python's Config(BaseModel) in models.py).
+type Config struct {
+	AutoRefresh          bool   `yaml:"auto_refresh"`
+	RefreshIntervalHours int    `yaml:"refresh_interval_hours"`
+	DefaultUserAgent     string `yaml:"default_user_agent"`
+	TimeoutSeconds       int    `yaml:"timeout_seconds"`
+}
+
+// DefaultConfig mirrors the Pydantic field defaults.
+func DefaultConfig() Config {
+	return Config{
+		AutoRefresh:          false,
+		RefreshIntervalHours: 24,
+		DefaultUserAgent:     "scientific-surfing/0.1.0",
+		TimeoutSeconds:       30,
+	}
+}
+
+// Validate mirrors the two @validator methods on Config in models.py.
+func (c Config) Validate() error {
+	if c.RefreshIntervalHours < 1 {
+		return &ValidationError{Field: "refresh_interval_hours", Message: "must be at least 1 hour"}
+	}
+	if c.TimeoutSeconds < 1 {
+		return &ValidationError{Field: "timeout_seconds", Message: "must be at least 1 second"}
+	}
+	return nil
+}