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/Cargo.lock

@@ -1254,6 +1254,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sqlx",
+ "sysinfo",
  "tauri",
  "tauri-build",
  "tauri-helper",
@@ -2504,6 +2505,15 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "650eef8c711430f1a879fdd01d4745a7deea475becfb90269c06775983bbf086"
 
+[[package]]
+name = "ntapi"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3b335231dfd352ffb0f8017f3b6027a4917f7df785ea2143d8af2adc66980ae"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "num-conv"
 version = "0.2.2"
@@ -2670,6 +2680,16 @@ dependencies = [
  "objc2-core-foundation",
 ]
 
+[[package]]
+name = "objc2-io-kit"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33fafba39597d6dc1fb709123dfa8289d39406734be322956a69f0931c73bb15"
+dependencies = [
+ "libc",
+ "objc2-core-foundation",
+]
+
 [[package]]
 name = "objc2-io-surface"
 version = "0.3.2"
@@ -2681,6 +2701,17 @@ dependencies = [
  "objc2-core-foundation",
 ]
 
+[[package]]
+name = "objc2-open-directory"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb82bed227edf5201dfedf072bba4015a33d3d4a98519837295a90f0a23f676d"
+dependencies = [
+ "objc2",
+ "objc2-core-foundation",
+ "objc2-foundation",
+]
+
 [[package]]
 name = "objc2-osa-kit"
 version = "0.3.2"
@@ -4210,6 +4241,21 @@ dependencies = [
  "syn 3.0.9",
 ]
 
+[[package]]
+name = "sysinfo"
+version = "0.39.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2071df9448915b71c4fe6d25deaf1c22f12bd234f01540b77312bb8e41361e6"
+dependencies = [
+ "libc",
+ "memchr",
+ "ntapi",
+ "objc2-core-foundation",
+ "objc2-io-kit",
+ "objc2-open-directory",
+ "windows",
+]
+
 [[package]]
 name = "system-configuration"
 version = "0.7.0"