refactor(state/proxy): use Box<Value> for providers_proxies to reduce struct size

- Changed providers_proxies from Value to Box<Value> in CmdProxyState
- Reduces struct size from 32 bytes to 8 bytes, optimizing memory usage

src-tauri/src/state/proxy.rs

@@ -1,8 +1,10 @@
+use serde_json::Value;
+
 pub struct CmdProxyState {
     pub last_refresh_time: std::time::Instant,
     pub need_refresh: bool,
-    pub proxies: serde_json::Value,
-    pub providers_proxies: serde_json::Value,
+    pub proxies: Box<Value>,
+    pub providers_proxies: Box<Value>,
 }
 
 impl Default for CmdProxyState {
@@ -10,8 +12,8 @@ impl Default for CmdProxyState {
         Self {
             last_refresh_time: std::time::Instant::now(),
             need_refresh: true,
-            proxies: serde_json::Value::Null,
-            providers_proxies: serde_json::Value::Null,
+            proxies: Box::new(Value::Null),
+            providers_proxies: Box::new(Value::Null),
         }
     }
 }