feat: migrate iOS release to fastlane for simplified code signing

ios/LibNovel/.gitignore

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+# Fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+fastlane/README.md
+
+# Bundler
+.bundle
+vendor/bundle

ios/LibNovel/Gemfile

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+source "https://rubygems.org"
+
+gem "fastlane"

ios/LibNovel/fastlane/Fastfile

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+default_platform(:ios)
+
+platform :ios do
+  desc "Build and upload to TestFlight"
+  lane :beta do
+    # Generate Xcode project from project.yml
+    sh("xcodegen generate --spec project.yml --project .")
+
+    # Set build number from CI run number (passed as env var)
+    increment_build_number(
+      build_number: ENV["BUILD_NUMBER"] || "1",
+      xcodeproj: "LibNovel.xcodeproj"
+    )
+
+    # Build the app
+    build_app(
+      scheme: "LibNovel",
+      export_method: "app-store",
+      clean: true,
+      export_options: {
+        provisioningProfiles: {
+          "com.kalekber.LibNovel" => ENV["PROVISIONING_PROFILE_NAME"] || "LibNovel Distribution"
+        }
+      }
+    )
+
+    # Upload to TestFlight
+    upload_to_testflight(
+      skip_waiting_for_build_processing: true
+    )
+  end
+end