Add config validation for required fields

internal/config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"fmt"
 	"os"
 	"ssender/internal/models"
 
@@ -22,9 +23,20 @@ func NewConfig(configPath string) (*models.Config, error) {
 	d := yaml.NewDecoder(file)
 
 	// Start YAML decoding from file
-	if err := d.Decode(&config); err != nil {
+	if err := d.Decode(config); err != nil {
 		return nil, err
 	}
 
+	// Validate required fields
+	if config.Dbpath == "" {
+		return nil, fmt.Errorf("dbpath is required in config")
+	}
+	if config.Telegram.Send && (config.Telegram.Token == "" || config.Telegram.ChatId == 0) {
+		return nil, fmt.Errorf("telegram token and chatid are required when send is enabled")
+	}
+	if config.VK.Send && (config.VK.Token == "" || config.VK.OwnerId == 0) {
+		return nil, fmt.Errorf("vk token and ownerid are required when send is enabled")
+	}
+
 	return config, nil
 }