feat: add configurable tool call blocking and monitoring

internal/config/tool_guard.go

@@ -0,0 +1,39 @@
+package config
+
+import (
+	"fmt"
+
+	"cyberstrike-ai/internal/toolguard"
+
+	"gopkg.in/yaml.v3"
+)
+
+// EffectiveToolGuard enables the default government-domain protection for old
+// configurations as well as new installs. An explicit config may disable it.
+func (c *Config) EffectiveToolGuard() toolguard.Config {
+	if c.ToolGuard == nil {
+		return toolguard.DefaultConfig()
+	}
+	return *c.ToolGuard
+}
+
+// validateToolGuardYAML requires an explicit decision for both protection and
+// its rules whenever a non-null section is supplied. Otherwise a typo or partial
+// section could silently turn the enabled-by-default protection off. Pointer
+// fields distinguish false/[] from omitted or null values, and the YAML decoder
+// continues to support aliases and merged configuration mappings.
+func validateToolGuardYAML(data []byte) error {
+	var document struct {
+		ToolGuard *struct {
+			Enabled *bool             `yaml:"enabled"`
+			Rules   *[]toolguard.Rule `yaml:"rules"`
+		} `yaml:"tool_guard"`
+	}
+	if err := yaml.Unmarshal(data, &document); err != nil {
+		return err
+	}
+	if section := document.ToolGuard; section != nil && (section.Enabled == nil || section.Rules == nil) {
+		return fmt.Errorf("tool_guard 必须明确提供 enabled 和 rules；清空规则请提供空数组")
+	}
+	return nil
+}