feat(macos,ios): entitlements + permission strings + bundle-glue script

macOS:
  * Runner/DebugProfile.entitlements + Release.entitlements: add
    com.apple.security.network.client (outbound TS3 server connect)
    and com.apple.security.device.audio-input (microphone capture).
    Debug keeps com.apple.security.network.server + cs.allow-jit
    (Flutter hot-reload needs both); Release drops them.
  * Runner/Info.plist: add NSMicrophoneUsageDescription and
    NSInputMonitoringUsageDescription so the macOS system prompts
    show a sensible explanation when Chanora first needs mic or
    Input Monitoring access. Input Monitoring is required by
    CGEventTapCreate (SDD-085).
  * Runner.xcodeproj/project.pbxproj: switch Debug/Release/Profile
    code-signing from Automatic + Apple Development to Manual +
    "Sign to Run Locally" (CODE_SIGN_IDENTITY = -). This lets
    `flutter build macos --release` work over SSH where the login
    keychain is locked. The owner re-enables the personal team
    locally in Xcode for physical-device iOS testing later.

iOS:
  * Runner/Info.plist: add NSMicrophoneUsageDescription and the
    UIBackgroundModes = ['audio'] entry so voice traffic continues
    when the app is backgrounded (TS3 servers drop clients on idle
    audio streams).

tools/macos-postbuild.sh: new script. flutter build macos --release
emits build/macos/Build/Products/Release/chanora_flutter.app but
does NOT bundle libchanora_bridge.dylib. FRB on macOS dlopen()s the
bridge as chanora_bridge.framework/chanora_bridge, not a plain
dylib. This script:

  1. Wraps target/release/libchanora_bridge.dylib in a proper
     chanora_bridge.framework (Versions/A layout, Info.plist,
     Resources, symlinks).
  2. Rewrites LC_ID_DYLIB to
     @rpath/chanora_bridge.framework/chanora_bridge.
  3. Ad-hoc codesigns the framework and the .app bundle.
  4. Verifies with codesign --verify --deep --strict.

macOS analogue of buildit.cmd on Windows. Auto-integration into
Xcode build phases via cargokit / corrosion is a P1 carryover.

Verified end-to-end on the M1 Mac:
  cargo build --release -p chanora_bridge          11.76 s
  flutter build macos --release                    ok (59.2 MB)
  tools/macos-postbuild.sh Release                 ok
  chanora_flutter.app launch via SSH               bridge initialised,
                                                   identity + bookmark
                                                   store initialised
                                                   (~5 s smoke).
  ~/Library/Logs/app.chanora.chanora_flutter/chanora.log captures
  the boot sequence cleanly.

DEC-025 reference: macOS desktop is officially in scope.

apps/chanora_flutter/ios/Runner/Info.plist

@@ -26,6 +26,8 @@
 	<string>$(FLUTTER_BUILD_NUMBER)</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>NSMicrophoneUsageDescription</key>
+	<string>Chanora needs microphone access so you can talk on your TeamSpeak-compatible voice server.</string>
 	<key>UIApplicationSceneManifest</key>
 	<dict>
 		<key>UIApplicationSupportsMultipleScenes</key>
@@ -49,6 +51,10 @@
 	</dict>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+	</array>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>
 	<key>UIMainStoryboardFile</key>