feat: optimize network stack (#404)

* feat: optimize network stack and connection management

Refactor OkHttp connection pools, consolidate Gson serialization, add network-aware WebSocket reconnects, and deduplicate concurrent requests.

* test: update mapping assertions for AuthExpired

* refactor: address PR review feedback on network stack

Simplify health check, improve authenticator cookie matching robustness, resolve nit imports, and add unit tests.

app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt

@@ -2,10 +2,12 @@ package com.m57.hermescontrol
 
 import android.app.Application
 import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.remote.NetworkMonitor
 
 class HermesControlApp : Application() {
     override fun onCreate() {
         super.onCreate()
         AuthManager.init(this)
+        NetworkMonitor.init(this)
     }
 }