feat: 添加新插件支持及多项功能改进

- 新增磁盘加密、打印审计和剪贴板管控插件支持
- 优化水印插件显示效果，支持中文及更多Unicode字符
- 改进硬件资产收集逻辑，更准确获取磁盘和显卡信息
- 增强API错误处理，添加详细日志记录
- 完善前端界面，新增插件管理页面
- 修复多个UI问题，优化页面过渡效果
- 添加环境变量覆盖配置功能
- 实现插件状态管理API
- 更新文档和变更日志
- 添加安装程序脚本支持

migrations/012_disk_encryption.sql

@@ -0,0 +1,29 @@
+-- 012_disk_encryption.sql: Disk Encryption Detection plugin (全盘加密检测)
+
+-- BitLocker / encryption status per device drive
+CREATE TABLE IF NOT EXISTS disk_encryption_status (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    device_uid      TEXT NOT NULL,
+    drive_letter    TEXT NOT NULL,          -- e.g. "C:", "D:"
+    volume_name     TEXT,
+    encryption_method TEXT,                 -- "BitLocker", "None", "Unknown"
+    protection_status TEXT NOT NULL DEFAULT 'Unknown', -- "On", "Off", "Unknown"
+    encryption_percentage REAL NOT NULL DEFAULT 0,
+    lock_status     TEXT NOT NULL DEFAULT 'Unknown',    -- "Locked", "Unlocked"
+    reported_at     TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at      TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY (device_uid) REFERENCES devices(device_uid),
+    UNIQUE(device_uid, drive_letter)
+);
+
+-- Compliance alerts when unencrypted drives detected
+CREATE TABLE IF NOT EXISTS encryption_alerts (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    device_uid      TEXT NOT NULL,
+    drive_letter    TEXT NOT NULL,
+    alert_type      TEXT NOT NULL DEFAULT 'not_encrypted', -- "not_encrypted", "encryption_paused", "decrypted"
+    status          TEXT NOT NULL DEFAULT 'open',           -- "open", "acknowledged", "resolved"
+    created_at      TEXT NOT NULL DEFAULT (datetime('now')),
+    resolved_at     TEXT,
+    FOREIGN KEY (device_uid) REFERENCES devices(device_uid)
+);