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/ClipboardHistoryPolicyTests.swift

@@ -126,4 +126,33 @@ final class ClipboardHistoryPolicyTests: XCTestCase {
         )
         XCTAssertEqual(tokens, ["great", "experience", "he", "writes"])
     }
+
+    func testContentFingerprintIsStableAndTextSensitive() {
+        let first = ClipboardHistoryPolicy.contentFingerprint(for: "same message")
+        let second = ClipboardHistoryPolicy.contentFingerprint(for: "same message")
+        let other = ClipboardHistoryPolicy.contentFingerprint(for: "same message!")
+        XCTAssertEqual(first, second)
+        XCTAssertEqual(first.count, 64)
+        XCTAssertNotEqual(first, other)
+    }
+
+    func testRepeatSuppressionEndsAfterHintWindow() {
+        let firedAt = Date()
+        XCTAssertTrue(
+            ClipboardHistoryPolicy.isRepeatSuppressed(
+                firedAt: firedAt,
+                now: firedAt.addingTimeInterval(
+                    ClipboardHistoryPolicy.aiHintEligibilitySeconds - 1
+                )
+            )
+        )
+        XCTAssertFalse(
+            ClipboardHistoryPolicy.isRepeatSuppressed(
+                firedAt: firedAt,
+                now: firedAt.addingTimeInterval(
+                    ClipboardHistoryPolicy.aiHintEligibilitySeconds + 1
+                )
+            )
+        )
+    }
 }