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)

OSGKeyboardTests/KeyboardExtensionMemoryBudgetTests.swift

@@ -112,6 +112,22 @@ final class KeyboardExtensionMemoryReliefTests: XCTestCase {
         XCTAssertEqual(levels(), [.critical, .critical, .critical])
     }
 
+    func testReliefIsNeverRequestedFromInsideRelief() {
+        let box = LevelBox()
+        KeyboardExtensionMemoryTelemetry.begin(context: "test")
+        KeyboardExtensionMemoryTelemetry.stopSampling()
+        KeyboardExtensionMemoryTelemetry.reliefHandler = { level in
+            box.levels.append(level)
+            // Shedding records milestones, and recording samples memory again.
+            // Without the reentrancy gate this re-entered the handler until the
+            // main thread's stack ran out — the crash this test pins down.
+            KeyboardExtensionMemoryTelemetry.simulateFootprintForTesting(49)
+            return true
+        }
+        KeyboardExtensionMemoryTelemetry.simulateFootprintForTesting(49)
+        XCTAssertEqual(box.levels, [.critical])
+    }
+
     func testRepeatedHighFootprintShedsOnce() {
         let (levels, _) = armedLevels()
         KeyboardExtensionMemoryTelemetry.simulateFootprintForTesting(41)