fix: sécuriser shutdown, config par défaut et reconnexion socket

Co-authored-by: aider (openrouter/openai/gpt-5.3-codex) <aider@aider.chat>

internal/config/loader.go

@@ -3,6 +3,7 @@ package config
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"strconv"
@@ -28,13 +29,17 @@ func NewLoader(configPath string) *LoaderImpl {
 func (l *LoaderImpl) Load() (api.AppConfig, error) {
 	config := api.DefaultConfig()
 
-	// Load from YAML file if path is provided
-	if l.configPath != "" {
-		fileConfig, err := l.loadFromFile(l.configPath)
-		if err != nil {
-			return config, fmt.Errorf("failed to load config file: %w", err)
-		}
+	path := l.configPath
+	explicit := path != ""
+	if !explicit {
+		path = "config.yml"
+	}
+
+	fileConfig, err := l.loadFromFile(path)
+	if err == nil {
 		config = mergeConfigs(config, fileConfig)
+	} else if !( !explicit && errors.Is(err, os.ErrNotExist)) {
+		return config, fmt.Errorf("failed to load config file: %w", err)
 	}
 
 	// Override with environment variables