chore: drop iOS 18–25 / non-iPhone support, require iOS 26

Two related cleanups the user asked for in one shot:

1. iPhone-only is now enforced at every target — Mac Catalyst and
   visionOS were never configured in `project.yml`, but the
   `OSGKeyboardShared` framework and the two test bundles were
   still defaulting to `TARGETED_DEVICE_FAMILY = "1,2"` (iPhone +
   iPad). All four targets now explicitly set `"1"`. SDK is
   `iphoneos` for everyone, no `xros` / `macosx`.

2. Deployment target bumped from iOS 18.0 to iOS 26.0 across the
   board (`project.yml` + the ext's per-target setting). With
   iOS 26 as the floor, the iOS 18–25 SFSpeechRecognizer path
   became dead code and several `#available` checks became
   always-true. Removed:

   - `AppleSpeechASR` (the entire SFSpeechRecognizer-based ASR
     backend) and the `#available(iOS 26.0, *)` factory branch.
     `ASRServiceFactory.make()` now returns `SpeechAnalyzerASR()`
     directly. SpeechAnalyzer is always fully on-device, which
     also made the `requiresOnDevice` flag meaningless.
   - `requiresOnDevice` from the `ASRService.transcribe` protocol
     signature, from `ProviderConfig`, `AppGroupStore`,
     `KeyboardState`, `AppGroupPersistor`, and the ext's
     `KeyboardViewController` (`state.requiresOnDevice`,
     `state.setRequiresOnDevice`, `persistRequiresOnDevice`).
   - `#available(iOS 17.0, *)` branch in
     `PreviewASRController.requestMicrophonePermission` and the
     ext's `PermissionManager.requestMicPermission` — both now
     just call the iOS 17+ `AVAudioApplication` API directly.
   - The `else` (iOS 18–25) branch in `SettingsView.asrEngineRow`
     — the on-device-only toggle is gone, the row is a static
     "SpeechAnalyzer active" badge. Same for the `else` branch
     in `EnginePickerSection.localSubtitle`.
   - `makeMicAuthHandler` (the iOS < 17 mic permission callback
     wrapper) from `PreviewASRController`.

   No `#available` / `@available` checks remain in the codebase
   except for the SpeechAnalyzer class itself (now unnecessary
   too, but kept for clarity — `AVAudioApplication` and
   `SpeechAnalyzer` are both iOS 17+ / iOS 26+ respectively,
   and the deployment target of 26 makes the explicit
   `@available` redundant; I left the SpeechAnalyzer class
   un-`@available` and removed the `@available(iOS 26.0, *)`
   decoration since it's no longer needed).

   The Keyboard ext's existing ASRService usage
   (`asr.transcribe(stream:locale:)`) is unchanged at the
   call-site level — just the third argument is gone.

3. Updated `info.plist` UISupportedInterfaceOrientations is
   already `[UIInterfaceOrientationPortrait]` only, which is
   correct for an iPhone-only app; no change needed.

Build: BUILD SUCCEEDED.
Tests: 22/22 pass.
Verified: `TARGETED_DEVICE_FAMILY = 1` on all four targets,
`SDKROOT = iphoneos` on all four.

🤖 Generated with Claude Code

project.yml

@@ -5,8 +5,13 @@
 name: OSGKeyboard
 options:
   bundleIdPrefix: com.osgkeyboard
+  # Minimum OS: iOS 26. We dropped iOS 18–25 support so the
+  # SFSpeechRecognizer + AVAudioSession branching could be removed in
+  # favour of iOS 26's `SpeechAnalyzer` (always on-device) and
+  # `AVAudioApplication.requestRecordPermission` (iOS 17+). iPhone
+  # only — no Mac Catalyst, no visionOS.
   deploymentTarget:
-    iOS: "18.0"
+    iOS: "26.0"
   developmentLanguage: en
   createIntermediateGroups: true
   generateEmptyDirectories: true
@@ -15,7 +20,7 @@ options:
 settings:
   base:
     SWIFT_VERSION: "6.0"
-    IPHONEOS_DEPLOYMENT_TARGET: "18.0"
+    IPHONEOS_DEPLOYMENT_TARGET: "26.0"
     ENABLE_USER_SCRIPT_SANDBOXING: YES
     SWIFT_STRICT_CONCURRENCY: complete
     GENERATE_INFOPLIST_FILE: NO
@@ -110,7 +115,7 @@ targets:
       - path: OSGKeyboardExt/zh-Hans.lproj
     settings:
       base:
-        IPHONEOS_DEPLOYMENT_TARGET: "18.0"
+        IPHONEOS_DEPLOYMENT_TARGET: "26.0"
     entitlements:
       path: OSGKeyboardExt/OSGKeyboardExt.entitlements
       properties:
@@ -158,6 +163,7 @@ targets:
     settings:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: com.osgkeyboard.ios.shared
+        TARGETED_DEVICE_FAMILY: "1"
         DEFINES_MODULE: YES
         SKIP_INSTALL: YES
         BUILD_LIBRARY_FOR_DISTRIBUTION: NO
@@ -183,6 +189,7 @@ targets:
     settings:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: com.osgkeyboard.ios.tests
+        TARGETED_DEVICE_FAMILY: "1"
 
   # =========================================================
   # 键盘扩展单元测试 (TEST-4)
@@ -199,6 +206,7 @@ targets:
     settings:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: com.osgkeyboard.ios.ext.tests
+        TARGETED_DEVICE_FAMILY: "1"
 
 schemes:
   OSGKeyboard: