fix(ios): rename podspec to AudioRoute.podspec so cap sync/pod install resolves it

Capacitor derives the pod name from the npm package name (audio-route -> AudioRoute)
and writes 'pod AudioRoute, :path => ../../plugins/audio-route' into the generated
Podfile. CocoaPods then requires a file literally named AudioRoute.podspec whose
s.name is 'AudioRoute'. The old AudioRoutePlugin.podspec (s.name AudioRoutePlugin)
caused the Codemagic build to fail with 'No podspec found for AudioRoute'.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mobile/plugins/audio-route/AudioRoute.podspec

@@ -0,0 +1,21 @@
+require 'json'
+
+package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
+
+Pod::Spec.new do |s|
+  # NOTE: the pod name MUST be 'AudioRoute' (PascalCase of the npm package name 'audio-route').
+  # Capacitor's `cap sync` writes `pod 'AudioRoute', :path => '../../plugins/audio-route'` into the
+  # generated Podfile, and CocoaPods then looks for a file literally named AudioRoute.podspec whose
+  # s.name is 'AudioRoute'. Any other name → "No podspec found for `AudioRoute`" and pod install fails.
+  s.name = 'AudioRoute'
+  s.version = package['version']
+  s.summary = package['description']
+  s.license = package['license']
+  s.homepage = 'https://bizgaze.com'
+  s.author = 'BizGaze'
+  s.source = { :git => 'https://bizgaze.com/audio-route.git', :tag => s.version.to_s }
+  s.source_files = 'ios/Sources/**/*.{swift,h,m}'
+  s.ios.deployment_target = '14.0'
+  s.dependency 'Capacitor'
+  s.swift_version = '5.1'
+end