[codex] Add Simplified Chinese localization and input settings

[kogekiplay]

Summary

• Add Simplified Chinese (zh-Hans) localization resources without adding an English localization table, so existing English literals remain the fallback.
• Localize dynamic UI strings that SwiftUI cannot resolve automatically from string variables.
• Add direct-mode drag behavior settings: the default direct one-finger drag now sends mouse-wheel scrolling, while the previous immediate-drag behavior remains available via Settings.
• Increase direct-mode scroll sensitivity and keep sub-step wheel accumulation for smoother small movements.
• In direct scroll mode, long-press then move performs left-button drag/selection; long-press without moving sends a right-click, matching the existing two-finger tap behavior.
• Add Copy/Paste controls to the in-session overlay. They now use a manual Shortcut Modifier setting: choose Control for Windows hosts and Command for Mac hosts.
• In direct mode, hide the remote system cursor and show a simple semi-transparent white touch point only around touch start; it hides after click, long-press, scroll, or drag actions.
• Add lightweight check scripts for required localization and input preference hooks, including guards against removed auto-keyboard and host auto-detection settings.

Validation

• scripts/check_localizations.sh
• scripts/check_input_preferences.sh
• plutil -lint OpenParsec/zh-Hans.lproj/Localizable.strings
• git diff --check
• rg -n "hostMacOS|shortcutModifierForHost|autoShowKeyboard|Auto Show Keyboard|showKeyboardIfEnabledAfterTap" OpenParsec returned no matches
• xcodebuild build -scheme OpenParsec -project OpenParsec.xcodeproj -sdk iphoneos -arch arm64 -configuration Release CODE_SIGN_IDENTITY= CODE_SIGNING_REQUIRED=NO CODE_SIGNING_ALLOWED=NO
• xcodebuild archive -archivePath /Users/kogeki/dev/OpenParsec/build/archive -scheme OpenParsec -project OpenParsec.xcodeproj -sdk iphoneos -arch arm64 -configuration Release CODE_SIGN_IDENTITY= CODE_SIGNING_REQUIRED=NO CODE_SIGNING_ALLOWED=NO
• /usr/bin/unzip -tq build/OpenParsec.ipa
• codesign --verify --deep --strict --verbose=2 build/Payload/OpenParsec.app
• plutil -extract GitCommitInfo raw -o - build/Payload/OpenParsec.app/Info.plist

Notes

• The generated unsigned IPA contains Payload/OpenParsec.app/zh-Hans.lproj/Localizable.strings.
• The generated IPA reports GitCommitInfo as Release (codex/zh-hans-localization/6e0efdf).
• The existing build script still prints a non-fatal cp Resources/*.lproj warning because the repository has no Resources directory; this PR does not change that unrelated script behavior.