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/014_clipboard_control.sql

@@ -0,0 +1,30 @@
+-- 014_clipboard_control.sql: Clipboard Control plugin (剪贴板管控)
+
+CREATE TABLE IF NOT EXISTS clipboard_rules (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    target_type     TEXT NOT NULL DEFAULT 'global' CHECK(target_type IN ('global', 'group', 'device')),
+    target_id       TEXT,
+    rule_type       TEXT NOT NULL DEFAULT 'block' CHECK(rule_type IN ('block', 'allow')),
+    -- Direction: "out" = prevent clipboard data leaving the source app
+    -- "in" = prevent pasting into the target app
+    direction       TEXT NOT NULL DEFAULT 'out' CHECK(direction IN ('out', 'in', 'both')),
+    source_process  TEXT,                    -- Process name pattern for source (copy from)
+    target_process  TEXT,                    -- Process name pattern for target (paste to)
+    content_pattern TEXT,                    -- Optional regex for content matching
+    enabled         INTEGER NOT NULL DEFAULT 1,
+    updated_at      TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS clipboard_violations (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    device_uid      TEXT NOT NULL,
+    source_process  TEXT,
+    target_process  TEXT,
+    content_preview TEXT,                    -- First N chars of clipboard content
+    action_taken    TEXT NOT NULL DEFAULT 'blocked', -- "blocked", "allowed"
+    timestamp       TEXT NOT NULL,
+    reported_at     TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY (device_uid) REFERENCES devices(device_uid)
+);
+
+CREATE INDEX IF NOT EXISTS idx_clipboard_violations_device ON clipboard_violations(device_uid);