fix: keyboard stability, host-only analytics, and auto-reply dedupe

- record analytics/usage only in the host app; the extension no longer opens the
  SQLite queues, so hiding the keyboard cannot hold WAL locks (0xdead10cc)
- sync clipboard history writes across processes so deletes made on one side
  are not reverted by the other
- guard memory-relief reentrancy on controller and telemetry sides to break
  the recursive crash loop
- resolve credentials off the main thread and migrate legacy keys once per
  install, so Keychain reads cannot be caught in the suspend window
- gate Volcengine ASR ping completion to once (SIGTRAP on double resume)
- treat same-text captures as the same logical copy and dedupe auto actions
  by content fingerprint within 30s, stopping Universal Clipboard storms
- realign version line to 2.1.0 (build 110)

OSGKeyboardShared/Services/AppGroupConfigDarwin.swift

@@ -20,3 +20,27 @@ public enum AppGroupConfigDarwin {
         )
     }
 }
+
+/// Cross-process Darwin notification for clipboard-history writes.
+///
+/// History is one whole-array JSON blob under a single key, so a peer holding a
+/// stale in-memory copy silently reverts the other side's deletes (and drops
+/// its new entries) on its next write. Every other shared surface already has a
+/// notification; this one did not.
+///
+/// A suspended process never receives Darwin notifications, so this covers only
+/// the window where both processes are alive. The host must still reload when it
+/// returns to the foreground.
+public enum ClipboardHistoryDarwin {
+    public static let notificationName = "com.osgkeyboard.clipboard.history.changed"
+
+    public static func postHistoryChanged() {
+        CFNotificationCenterPostNotification(
+            CFNotificationCenterGetDarwinNotifyCenter(),
+            CFNotificationName(notificationName as CFString),
+            nil,
+            nil,
+            true
+        )
+    }
+}