refactor: drop Qwen3 CoreML ASR, add local-engine cloud polish toggle

Rolls back the v0.2.0 Qwen3 CoreML on-device ASR stack and replaces the
'local engine' UX with iOS 26 SpeechAnalyzer + DictationTranscriber only.

The 'Cloud polish after ASR' toggle (ProviderConfig.localModeCloudPolishEnabled)
lets users opt into a post-ASR DeepSeek round-trip from the local engine.
Defaults to off so the local engine stays genuinely local. New PolishError.missingAPIError
surfaces an inline 'fill in your key' warning when the toggle is on but the
Keychain is empty. DeepSeek preset default model bumped to deepseek-v4-flash.

Deleted:
  - OSGKeyboard/ThirdParty/Qwen3Speech/ (74 files, ~16k LoC)
  - OSGKeyboard/Services/ModelManager.swift (492)
  - OSGKeyboard/Services/OnDeviceModelWarmup.swift (197)
  - OSGKeyboard/Services/Qwen3ASRService.swift (257)
  - OSGKeyboard/Services/ModelDownloadSourcePicker.swift (126)
  - OSGKeyboard/Views/OnDeviceModelsView.swift (184)
  - OSGKeyboard/Views/DownloadConfirmSheet.swift (96)
  - OSGKeyboardShared/Models/OnDeviceModel.swift (140)
  - OSGKeyboardShared/Services/OnDeviceModelStatus.swift (104)
  - Qwen3ASRServiceProvider registration in OSGKeyboardApp
  - Qwen3Speech package declaration in project.yml
  - 5 .qwen3ASR enum / branch reference sites in HomeView, OnboardingView,
    LocalEngineSettingsRows, FlowSessionManager, ASRService, EngineServiceLabel
  - Two pre-existing Swift 6 strict-concurrency errors in
    LiveDictationController + FlowSessionManager (the weak [weak self] in
    detached-task MainActor.run blocks) that were blocking clean builds

Added:
  - LocalModelsGroup: 'Built-in iOS SpeechAnalyzer' badge + 'Cloud polish
    after ASR' Switch toggle
  - PolishingService: honour localModeCloudPolishEnabled; new .missingAPIKey
    error case with localised warning
  - AppGroupStore.localModeCloudPolishEnabled (mirrored into App Group
    so the keyboard extension honours the toggle during live dictation)
  - SettingsView: show provider/api sections when local-mode cloud polish
    is on so the user can paste a DeepSeek key
  - FlowSessionManager: route through PolishingService for local + polish-on
    flow; translate missingAPIKey into a polished warning
  - KeyboardViewController: handle PolishingService.PolishError.missingAPIKey
    in the keyboard-side live polish path
  - CHANGELOG v0.2.1: documents the rollback + new toggle
  - README.md / README.zh.md: engine matrix section, data flow note

Verified: xcodebuild -scheme OSGKeyboard -destination 'generic/platform=iOS Simulator'
build succeeds under SWIFT_STRICT_CONCURRENCY=complete.

OSGKeyboardShared/Services/FlowSessionKeys.swift

@@ -31,18 +31,22 @@ public enum FlowSessionKeys {
     /// finishes most chunks during recording; this is a soft deadline before
     /// blocking on `asrTask.value` (which waits until the pipeline exits).
     public static let localASRWaitTimeout: TimeInterval = 120
-    public static let localQwen3ASRWaitTimeout: TimeInterval = 180
     public static let cloudASRWaitTimeout: TimeInterval = 120
 
     /// Keyboard watchdog after the user stops recording (not utterance max length).
-    /// Must cover worst-case post-stop backlog: remaining MLX/SpeechAnalyzer chunks
+    /// Must cover worst-case post-stop backlog: remaining SpeechAnalyzer chunks
     /// plus cloud LLM polish (see `PolishingService.effectiveTimeout` cap).
+    ///
+    /// As of v0.2.0 the local engine uses iOS `SpeechAnalyzer` only, so the
+    /// previous Qwen3-specific timeout (240 s) collapses into the shared
+    /// local path. We keep `localASRBackend` on the signature for symmetry
+    /// with other shared helpers.
     public static func keyboardResultTimeout(
         engineMode: String,
         localASRBackend: LocalASRBackend
     ) -> TimeInterval {
         if engineMode == "local" {
-            return localASRBackend == .qwen3ASR ? 240 : 180
+            return 180
         }
         return 240
     }