feat: implement decision-based routing with plugin architecture

Signed-off-by: bitliu <[email protected]>

Author: Xunzhuo

src/semantic-router/pkg/config/config.go

@@ -594,6 +594,14 @@ func unmarshalPluginConfig(config interface{}, target interface{}) error {
 			return fmt.Errorf("failed to marshal config: %w", err)
 		}
 		return json.Unmarshal(data, target)
+	case map[interface{}]interface{}:
+		// From YAML file with interface{} keys - convert to map[string]interface{} first
+		converted := convertMapToStringKeys(v)
+		data, err := json.Marshal(converted)
+		if err != nil {
+			return fmt.Errorf("failed to marshal config: %w", err)
+		}
+		return json.Unmarshal(data, target)
 	case []byte:
 		// From Kubernetes RawExtension - direct unmarshal
 		return json.Unmarshal(v, target)
@@ -602,6 +610,45 @@ func unmarshalPluginConfig(config interface{}, target interface{}) error {
 	}
 }
 
+// convertMapToStringKeys recursively converts map[interface{}]interface{} to map[string]interface{}
+func convertMapToStringKeys(m map[interface{}]interface{}) map[string]interface{} {
+	result := make(map[string]interface{})
+	for k, v := range m {
+		// Convert key to string
+		key, ok := k.(string)
+		if !ok {
+			key = fmt.Sprintf("%v", k)
+		}
+
+		// Recursively convert nested maps
+		switch val := v.(type) {
+		case map[interface{}]interface{}:
+			result[key] = convertMapToStringKeys(val)
+		case []interface{}:
+			result[key] = convertSliceValues(val)
+		default:
+			result[key] = v
+		}
+	}
+	return result
+}
+
+// convertSliceValues recursively converts slice elements that are maps
+func convertSliceValues(s []interface{}) []interface{} {
+	result := make([]interface{}, len(s))
+	for i, v := range s {
+		switch val := v.(type) {
+		case map[interface{}]interface{}:
+			result[i] = convertMapToStringKeys(val)
+		case []interface{}:
+			result[i] = convertSliceValues(val)
+		default:
+			result[i] = v
+		}
+	}
+	return result
+}
+
 // GetSemanticCacheConfig returns the semantic-cache plugin configuration
 func (d *Decision) GetSemanticCacheConfig() *SemanticCachePluginConfig {
 	config := d.GetPluginConfig("semantic-cache")