feat(tv): native tvOS search field via SwiftUI .searchable

Add a local `tv-search` Expo module that hosts SwiftUI's `.searchable`
in a UIHostingController (adapted from expo-tvos-search, minus its native
results grid). It emits typed text to React Native so the existing search
pipeline and custom TV results grid are reused. Handles the RN-tvOS remote
gesture release needed for keyboard input on device.

Wire it into TVSearchPage as a sticky header above the scrollable results,
with a TVFocusGuideView bridge so focus can move from the tab bar into the
native search field.

modules/tv-search/ios/TvSearch.podspec

@@ -0,0 +1,22 @@
+Pod::Spec.new do |s|
+  s.name           = 'TvSearch'
+  s.version        = '1.0.0'
+  s.summary        = 'Native tvOS search field with text change events'
+  s.description    = 'Hosts SwiftUI .searchable inside a UIHostingController so React Native can render its own results grid while using the native tvOS search bar and grid keyboard.'
+  s.author         = ''
+  s.homepage       = 'https://docs.expo.dev/modules/'
+  s.platforms      = {
+    :tvos => '15.1'
+  }
+  s.source         = { git: '' }
+  s.static_framework = true
+
+  s.dependency 'ExpoModulesCore'
+
+  s.pod_target_xcconfig = {
+    'DEFINES_MODULE' => 'YES',
+    'SWIFT_COMPILATION_MODE' => 'wholemodule'
+  }
+
+  s.source_files = "**/*.{h,m,mm,swift}"
+end