feat: 实现仪表盘页面及系统信息采集功能

新增系统信息采集后端服务，引入 sysinfo 依赖获取 CPU、内存、主机名、系统版本、架构和 IP 地址等数据；新增系统相关 API 接口和 TypeScript 类型定义；重构仪表盘页面，整合服务器/隧道数量统计、系统信息展示、资源占用监控和 Frpc 运行日志功能；新增中英文国际化文案支持，完善前端交互逻辑。

src-tauri/src/commands/mod.rs

@@ -1,2 +1,3 @@
 pub mod tunnel;
-pub mod server;
+pub mod server;
+pub mod system;

src-tauri/src/commands/system.rs

@@ -0,0 +1,72 @@
+use std::net::IpAddr;
+
+use sysinfo::{Networks, System};
+use tauri::State;
+use tauri_helper::auto_collect_command;
+
+use crate::models::{ApiResponse, SystemDetails, SystemInfo};
+use crate::services::system::SystemStats;
+
+/// 获取系统资源占用（CPU / 内存百分比）
+#[tauri::command]
+#[auto_collect_command]
+pub async fn get_system_info(
+    state: State<'_, SystemStats>,
+) -> Result<ApiResponse<SystemInfo>, String> {
+    let (cpu, memory) = state.snapshot();
+    Ok(ApiResponse::success(SystemInfo { cpu, memory }))
+}
+
+/// 获取系统信息（主机名、系统版本、架构、IP 地址）
+#[tauri::command]
+#[auto_collect_command]
+pub async fn get_system_details() -> Result<ApiResponse<SystemDetails>, String> {
+    Ok(ApiResponse::success(collect_details()))
+}
+
+fn collect_details() -> SystemDetails {
+    let hostname = System::host_name().unwrap_or_else(|| "-".to_string());
+    let os = System::long_os_version()
+        .or_else(System::os_version)
+        .or_else(System::name)
+        .unwrap_or_else(|| "-".to_string());
+    let arch = System::cpu_arch();
+
+    // 采集本机 IPv4 地址（过滤回环地址），并去重
+    let networks = Networks::new_with_refreshed_list();
+    let mut ips: Vec<String> = Vec::new();
+    for data in networks.list().values() {
+        for ip_net in data.ip_networks() {
+            if let IpAddr::V4(ipv4) = ip_net.addr {
+                if !ipv4.is_loopback() {
+                    ips.push(ipv4.to_string());
+                }
+            }
+        }
+    }
+    ips.sort();
+    ips.dedup();
+
+    SystemDetails {
+        hostname,
+        os,
+        arch,
+        ips,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn details_are_collected() {
+        let d = collect_details();
+        println!(
+            "hostname={}, os={}, arch={}, ips={:?}",
+            d.hostname, d.os, d.arch, d.ips
+        );
+        assert!(!d.hostname.is_empty());
+        assert!(!d.arch.is_empty());
+    }
+}