fix: 修复 Tauri 编译错误（SystemStatsResponse 定义）

问题：
- SystemStatsResponse 在 bin/proxy.rs 中定义
- 库模块 proxy.rs 和 validate.rs 试图从 super 导入，但路径错误

修复：
- 将 SystemStatsResponse 定义移到库模块 proxy.rs
- 在 validate.rs 中添加正确的导入
- 移除 bin/proxy.rs 中的重复定义（稍后处理）

src-tauri/src/proxy.rs

@@ -1244,7 +1244,36 @@ mod macmon_sampler {
     pub fn get_metrics() -> Option<MacmonData> { None }
 }
 
-pub use super::SystemStatsResponse;
+#[derive(serde::Serialize, serde::Deserialize)]
+pub struct SystemStatsResponse {
+    pub cpu_used_percent: f64,
+    pub memory_used_percent: f64,
+    pub memory_available_mb: u64,
+    pub memory_total_mb: u64,
+    pub swap_used_percent: f64,
+    pub swap_available_mb: u64,
+    pub swap_total_mb: u64,
+    pub gpu_available: bool,
+    pub gpu_utilization: Option<f64>,
+    pub gpu_memory_used_pct: Option<f64>,
+    pub ane_available: bool,
+    pub ane_utilization: Option<f64>,
+    pub source: String,
+    pub chip_name: Option<String>,
+    pub cpu_power: Option<f64>,
+    pub gpu_power: Option<f64>,
+    pub ane_power: Option<f64>,
+    pub sys_power: Option<f64>,
+    pub ram_power: Option<f64>,
+    pub cpu_temp: Option<f64>,
+    pub gpu_temp: Option<f64>,
+    pub ecpu_freq_mhz: Option<u32>,
+    pub pcpu_freq_mhz: Option<u32>,
+    pub gpu_freq_mhz: Option<u32>,
+    pub ecpu_cores: Option<u8>,
+    pub pcpu_cores: Option<u8>,
+    pub gpu_cores: Option<u8>,
+}
 
 async fn get_system_stats_handler() -> Response {
     // 1. Try macmon first (Apple Silicon only)

src-tauri/src/validate.rs

@@ -5,6 +5,8 @@ use std::path::Path;
 use std::process::Command;
 use std::time::{SystemTime, UNIX_EPOCH};
 
+use super::proxy::SystemStatsResponse;
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum ValidationStatus {
     Pass,
@@ -282,7 +284,7 @@ pub fn validate_thermal_state_via_pmset() -> Option<MetricValidation> {
 
 // ==================== Main Validation Function ====================
 
-pub fn run_validation(layers: &[u32], macmon_stats: &super::SystemStatsResponse) -> ValidationResult {
+pub fn run_validation(layers: &[u32], macmon_stats: &SystemStatsResponse) -> ValidationResult {
     write_log(&format!("[INFO] Validation started: layers={:?}", layers));
     
     let mut result = ValidationResult {