feat(aiturk): hide what the paired IDE cannot serve, plain error sentences, reconnect on return

When paired with AITURK IDE:
- an "unknown method" (-32601) answer and the proxy's 403/route-404 are shown
  as plain sentences, never as raw JsonRpcError text; a method the IDE does
  not have is not sent again on the same socket
- Account connectors, Vault, Keys and Files are hidden (the IDE has no
  connectors.* / vault.* and its phone proxy refuses /api/env and /api/files)
- an idle-closed chat socket is reopened when the app returns to the
  foreground; idle tunnel connections are dropped on a network change
- an unsaved chat no longer polls /api/sessions/<id>
- the pairing screen shows the app version

A plain Hermes connection is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B8ppceaR5s6cvMnm7uGRnf

app/src/main/java/com/m57/hermescontrol/notification/ChatNotificationService.kt

@@ -726,6 +726,11 @@ object NotificationHelper {
     ) {
         ChatNotificationService.setAppForeground(foreground)
         HermesWsClient.setAppForeground(foreground)
+        // AITURK: reopen the socket that was closed while idle in the background.
+        if (foreground) {
+            com.m57.hermescontrol.data.aiturk.AiturkCompat
+                .onAppForeground()
+        }
         if (!foreground) {
             BackgroundConnectionController.default.reconcileState()
         }