feat: 初始化项目基础架构和核心功能

- 添加项目基础结构：Cargo.toml、.gitignore、设备UID和密钥文件
- 实现前端Vue3项目结构：路由、登录页面、设备管理页面
- 添加核心协议定义(crates/protocol)：设备状态、资产、USB事件等
- 实现客户端监控模块：系统状态收集、资产收集
- 实现服务端基础API和插件系统
- 添加数据库迁移脚本：设备管理、资产跟踪、告警系统等
- 实现前端设备状态展示和基本交互
- 添加使用时长统计和水印功能插件

migrations/001_init.sql

@@ -0,0 +1,70 @@
+-- 001_init.sql: Core tables (users, devices, device_status)
+
+CREATE TABLE IF NOT EXISTS users (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    username    TEXT NOT NULL UNIQUE,
+    password    TEXT NOT NULL,
+    role        TEXT NOT NULL DEFAULT 'admin' CHECK(role IN ('admin', 'viewer')),
+    created_at  TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS devices (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    device_uid      TEXT NOT NULL UNIQUE,
+    hostname        TEXT NOT NULL,
+    ip_address      TEXT NOT NULL,
+    mac_address     TEXT,
+    os_version      TEXT,
+    client_version  TEXT,
+    device_secret   TEXT,               -- HMAC key for message authentication
+    status          TEXT NOT NULL DEFAULT 'offline' CHECK(status IN ('online', 'offline')),
+    last_heartbeat  TEXT,
+    registered_at   TEXT NOT NULL DEFAULT (datetime('now')),
+    group_name      TEXT DEFAULT 'default'
+);
+
+CREATE TABLE IF NOT EXISTS device_status (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    device_uid      TEXT NOT NULL REFERENCES devices(device_uid) ON DELETE CASCADE,
+    cpu_usage       REAL,
+    memory_usage    REAL,
+    memory_total_mb INTEGER,
+    disk_usage      REAL,
+    disk_total_mb   INTEGER,
+    network_rx_rate INTEGER,
+    network_tx_rate INTEGER,
+    running_procs   INTEGER,
+    top_processes   TEXT,
+    reported_at     TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at      TEXT NOT NULL DEFAULT (datetime('now')),
+    UNIQUE(device_uid)
+);
+
+CREATE TABLE IF NOT EXISTS device_status_history (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    device_uid      TEXT NOT NULL REFERENCES devices(device_uid) ON DELETE CASCADE,
+    cpu_usage       REAL,
+    memory_usage    REAL,
+    disk_usage      REAL,
+    network_rx_rate INTEGER,
+    network_tx_rate INTEGER,
+    running_procs   INTEGER,
+    reported_at     TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS device_groups (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    name        TEXT NOT NULL UNIQUE,
+    description TEXT,
+    parent_id   INTEGER REFERENCES device_groups(id),
+    created_at  TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+-- Insert default group
+INSERT OR IGNORE INTO device_groups (name, description) VALUES ('default', 'Default device group');
+
+-- Indexes
+CREATE INDEX IF NOT EXISTS idx_devices_status ON devices(status);
+CREATE INDEX IF NOT EXISTS idx_device_status_uid ON device_status(device_uid);
+CREATE INDEX IF NOT EXISTS idx_status_history_device_time ON device_status_history(device_uid, reported_at);
+CREATE INDEX IF NOT EXISTS idx_status_history_time ON device_status_history(reported_at);