fix(邮件发送): 适配 MailerSend SMTP 并迁移基础设施至 1Panel

Motivation:
将通知服务部署到 1Panel 生产环境，集成 MailerSend 邮件服务，修复 SMTP 协议中 MAIL FROM 命令因携带显示名而导致的发送失败问题。

Changes:

* 修复 SMTP MAIL FROM 命令传入带显示名的完整地址导致发送失败的问题，新增 extractEmailAddr 提取裸地址
* 更新 SMTP 配置为 MailerSend 真实凭证，From 地址适配其域名验证要求
* 移除 docker-compose 中内置的 MySQL/Redis 服务，改为依赖外部 1Panel 基础设施
* 更新环境变量为生产环境实际凭据

config/config.yaml

@@ -6,7 +6,7 @@ database:
   host: "mysql"
   port: 3306
   user: "root"
-  password: "${DB_PASSWORD:-7Qay8mksnwrCffGi}"
+  password: "${DB_PASSWORD:-notify}"
   database: "notification"
 
 redis:
@@ -16,11 +16,12 @@ redis:
   db: 0
 
 smtp:
-  host: "smtp.example.com"
+  host: "smtp.mailersend.net"
   port: 587
-  user: "notify@example.com"
+  user: "MS_hqXDZ6@516886.xyz"
   password: "${SMTP_PASSWORD:-}"
-  from: "Notification Service <notify@example.com>"
+  # MailerSend 要求 from 域名已验证；未验证 516886.xyz 前先用试用域名
+  from: "Notification Service <MS_hqXDZ6@516886.xyz>"
 
 rate_limit:
   default: 100

docker-compose.yml

@@ -1,58 +1,17 @@
 version: '3.8'
 
 services:
-  mysql:
-    image: mysql:8.0
-    environment:
-      MYSQL_ROOT_PASSWORD: rootpass
-      MYSQL_DATABASE: notification
-      MYSQL_USER: notify
-      MYSQL_PASSWORD: notify
-    ports:
-      - "3306:3306"
-    volumes:
-      - mysql_data:/var/lib/mysql
-    healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
-      interval: 5s
-      timeout: 3s
-      retries: 10
-    networks:
-      - 1panel-network
-
-  redis:
-    image: redis:7-alpine
-    ports:
-      - "6379:6379"
-    healthcheck:
-      test: ["CMD", "redis-cli", "ping"]
-      interval: 5s
-      timeout: 3s
-      retries: 5
-    networks:
-      - 1panel-network
-
   api:
     build: .
     ports:
       - "8080:8080"
     environment:
-      - DB_PASSWORD=notify
+      - SMTP_PASSWORD=mssp.92QdSYS.3z0vklo982xl7qrx.tSlSpXs
-      - SMTP_PASSWORD=
+      - DB_PASSWORD=7Qay8mksnwrCffGi
-      - NOTIFY_DATABASE_HOST=mysql
-      - NOTIFY_REDIS_HOST=redis
-    depends_on:
-      mysql:
-        condition: service_healthy
-      redis:
-        condition: service_healthy
     restart: unless-stopped
     networks:
       - 1panel-network
 
-volumes:
-  mysql_data:
-
 networks:
   1panel-network:
     external: true

internal/adapter/email.go

@@ -91,7 +91,9 @@ func (s *EmailSender) authAndSend(client *smtp.Client, to []string, msg []byte)
 		}
 	}
 
-	if err := client.Mail(s.cfg.From); err != nil {
+	// MAIL FROM must be a bare address; display names like "Name <a@b.c>" are invalid here.
+	fromAddr := extractEmailAddr(s.cfg.From)
+	if err := client.Mail(fromAddr); err != nil {
 		return fmt.Errorf("mail: %w", err)
 	}
 	for _, recipient := range to {
@@ -121,3 +123,13 @@ func buildEmail(from string, to []string, subject, body string) []byte {
 	sb.WriteString(body)
 	return []byte(sb.String())
 }
+
+// extractEmailAddr returns the bare address from "Name <addr@host>" or the original string.
+func extractEmailAddr(from string) string {
+	start := strings.LastIndex(from, "<")
+	end := strings.LastIndex(from, ">")
+	if start >= 0 && end > start {
+		return strings.TrimSpace(from[start+1 : end])
+	}
+	return strings.TrimSpace(from)
+}