[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/KeyboardViewController.swift

@@ -20,6 +20,7 @@
 import UIKit
 import SwiftUI
 import AVFoundation
+import Speech
 import OSGKeyboardShared
 
 @objc(KeyboardViewController)
@@ -199,12 +200,26 @@ public final class KeyboardViewController: UIInputViewController {
         // user already feels the press registered.
             Task { @MainActor [weak self] in
             guard let self else { return }
-            let granted = await self.requestMicPermission()
-            guard granted else {
+            let micGranted = await self.requestMicPermission()
+            guard micGranted else {
                 self.state.phase = .error("麦克风被拒绝,请到「设置」中允许")
                 self.scheduleAutoClearError()
                 return
             }
+            // iOS 18 SFSpeechRecognizer path: we explicitly ask for Speech
+            // recognition permission. Without this call + the
+            // NSSpeechRecognitionUsageDescription key in Info.plist the
+            // recogniser silently returns .denied and the user hears
+            // nothing back.
+            // iOS 26 SpeechAnalyzer path (planned for the next release)
+            // does not expose an explicit request API — the framework
+            // prompts via the same plist key on first use.
+            let speechGranted = await self.requestSpeechPermission()
+            guard speechGranted else {
+                self.state.phase = .error("语音识别被拒绝,请到「设置」中允许")
+                self.scheduleAutoClearError()
+                return
+            }
             self.startPipeline()
         }
     }
@@ -348,6 +363,24 @@ public final class KeyboardViewController: UIInputViewController {
         }
     }
 
+    /// Request Speech Recognition permission. Returns true if granted
+    /// (or already authorised). For the iOS 18 SFSpeechRecognizer path
+    /// this is required before recognition can begin; for the iOS 26
+    /// SpeechAnalyzer path the framework prompts on first use.
+    private func requestSpeechPermission() async -> Bool {
+        await withCheckedContinuation { (cont: CheckedContinuation<Bool, Never>) in
+            SFSpeechRecognizer.requestAuthorization { status in
+                switch status {
+                case .authorized: cont.resume(returning: true)
+                case .denied, .restricted, .notDetermined:
+                    cont.resume(returning: false)
+                @unknown default:
+                    cont.resume(returning: false)
+                }
+            }
+        }
+    }
+
     // MARK: - Open host app
 
     private func openHostApp() {