[P0-②] On-device ASR three-piece set

- Add NSSpeechRecognitionUsageDescription to both target Info.plists
- KeyboardViewController.requestSpeechPermission() wraps
  SFSpeechRecognizer.requestAuthorization
- pressBegan() now requests Speech permission right after mic permission
- ASRService emits a DEBUG warning when recognizer.supportsOnDeviceRecognition
  is false so cloud fallback is visible during dev
- CHANGELOG: move iOS 26 SpeechAnalyzer out of Unreleased into [0.2.0] Planned,
  so the iOS 18 SFSpeechRecognizer path is the only ASR shipped in v0.1

xcodebuild iOS Simulator: SUCCEEDED

OSGKeyboardExt/Services/ASRService.swift

@@ -73,6 +73,11 @@ final class AppleSpeechASR: ASRService, @unchecked Sendable {
             let request = SFSpeechAudioBufferRecognitionRequest()
             request.shouldReportPartialResults = true
             request.requiresOnDeviceRecognition = recognizer.supportsOnDeviceRecognition
+            if !recognizer.supportsOnDeviceRecognition {
+                #if DEBUG
+                print("⚠️ 设备不支持 \(locale.identifier) 端侧 ASR, 回退云端。")
+                #endif
+            }
 
             let task = recognizer.recognitionTask(with: request) { result, error in
                 if let error {