feat(desktop): Gateway URL 配置化 + Rust panic hook 崩溃报告

- api-urls.ts: GATEWAY_URLS 读 VITE_GATEWAY_HTTP/WS env
- gateway-storage.ts: DEFAULT_GATEWAY_URL 读 VITE_GATEWAY_WS env
- lib.rs: 添加 tracing_subscriber 初始化 + panic::set_hook
  崩溃时自动写入 crash-reports/ 目录供诊断
- Cargo.toml: 添加 tracing-subscriber workspace 依赖

desktop/src-tauri/src/lib.rs

@@ -49,6 +49,45 @@ mod dev_server;
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
+    // Initialize tracing subscriber for structured logging
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info")),
+        )
+        .with_thread_ids(true)
+        .with_file(true)
+        .with_line_number(true)
+        .init();
+
+    // Install panic hook to capture crash info for diagnostics
+    std::panic::set_hook(Box::new(|info| {
+        let location = info.location().map(|l| format!("{}:{}", l.file(), l.line()))
+            .unwrap_or_else(|| "unknown".into());
+        let payload = if let Some(s) = info.payload().downcast_ref::<&str>() {
+            s.to_string()
+        } else if let Some(s) = info.payload().downcast_ref::<String>() {
+            s.clone()
+        } else {
+            "unknown panic payload".into()
+        };
+        tracing::error!(location = %location, payload = %payload, "PANIC — application crashed");
+
+        // Write crash log to disk for post-mortem analysis
+        if let Some(app_dir) = dirs::data_local_dir()
+            .or_else(|| dirs::data_dir())
+        {
+            let crash_dir = app_dir.join("zclaw").join("crash-reports");
+            let _ = std::fs::create_dir_all(&crash_dir);
+            let timestamp = chrono::Local::now().format("%Y%m%d_%H%M%S");
+            let crash_file = crash_dir.join(format!("crash_{}.log", timestamp));
+            let _ = std::fs::write(&crash_file, format!(
+                "ZCLAW Crash Report\n==================\nTime: {}\nLocation: {}\nPayload: {}\n\n{:?}",
+                chrono::Local::now().to_rfc3339(), location, payload, info,
+            ));
+        }
+    }));
+
     // Start development server when dev-server feature is enabled
     #[cfg(feature = "dev-server")]
     {