Telegram Webhookによるボット操作機能を追加（課題の追加・完了・一覧・スヌーズ対応）

internal/config/config.go

@@ -18,7 +18,8 @@ type DatabaseConfig struct {
 }
 
 type NotificationConfig struct {
-	TelegramBotToken string
+	TelegramBotToken     string
+	TelegramWebhookSecret string
 }
 
 type CaptchaConfig struct {
@@ -146,6 +147,9 @@ func Load(configPath string) *Config {
 		if section.HasKey("telegram_bot_token") {
 			cfg.Notification.TelegramBotToken = section.Key("telegram_bot_token").String()
 		}
+		if section.HasKey("telegram_webhook_secret") {
+			cfg.Notification.TelegramWebhookSecret = section.Key("telegram_webhook_secret").String()
+		}
 
 		// Captcha section
 		section = iniFile.Section("captcha")
@@ -210,6 +214,9 @@ func Load(configPath string) *Config {
 	if telegramToken := os.Getenv("TELEGRAM_BOT_TOKEN"); telegramToken != "" {
 		cfg.Notification.TelegramBotToken = telegramToken
 	}
+	if webhookSecret := os.Getenv("TELEGRAM_WEBHOOK_SECRET"); webhookSecret != "" {
+		cfg.Notification.TelegramWebhookSecret = webhookSecret
+	}
 	if captchaEnabled := os.Getenv("CAPTCHA_ENABLED"); captchaEnabled != "" {
 		cfg.Captcha.Enabled = captchaEnabled == "true" || captchaEnabled == "1"
 	}