fix(input): add META_LEFT/META_RIGHT keycode support for macOS CMD key

[YW1975]

Summary

Fixes #18466

On macOS, pressing the CMD (Meta) key incorrectly reported keyCode 0 (unknown) instead of the correct values (91 for left CMD, 93 for right CMD). This is because the TypeScript KeyCode enum and key mapping tables were missing META_LEFT/META_RIGHT entries, even though the C++ native layer already handled these keys correctly.

Changes

• cocos/input/types/key-code.ts: Added META_LEFT = 91 and META_RIGHT = 93 to the KeyCode enum, placed between KEY_Z = 90 and NUM_0 = 96 following numeric ordering. Values match the C++ definitions in EngineEvents.h.

• pal/input/keycodes.ts: Added MetaLeft and MetaRight entries to the code2KeyCode mapping, enabling web platform to correctly map KeyboardEvent.code = "MetaLeft" / "MetaRight".

• pal/input/native/keyboard-input.ts: Added 91 and 93 fallback entries to nativeKeyCode2KeyCode for native platform support when event.code is unavailable.

Why this matters

CMD is the primary modifier key on macOS — equivalent to Ctrl on Windows. Without this fix:

• CMD+click multi-select in games doesn't work
• CMD-based shortcut detection is broken
• Any game relying on modifier key detection is broken on Mac

Verification

• npx tsc --noEmit — No compilation errors related to the changes (pre-existing errors from missing native external type definitions remain)
• npx jest — 161/161 suites fail identically to unmodified main branch (pre-existing test infrastructure issue)
• Pure data addition: enum values + mapping entries, no logic changes

Test plan

• Verify EventKeyboard.keyCode returns 91 when pressing left CMD on macOS (web)
• Verify EventKeyboard.keyCode returns 93 when pressing right CMD on macOS (web)
• Verify CMD key detection works on macOS native builds
• Verify no regression on other platforms (Windows, Linux, mobile)

🤖 Generated with Claude Code

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Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1009738 bytes	1009765 bytes	⚠️ +27 bytes
2D All (legacy pipeline)	2675347 bytes	2675374 bytes	⚠️ +27 bytes
2D All (new pipeline)	2767083 bytes	2767110 bytes	⚠️ +27 bytes
(2D + 3D) All	10024081 bytes	10024108 bytes	⚠️ +27 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16843143 bytes	16843195 bytes	⚠️ +52 bytes

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -33729,8 +33729,18 @@
          * @zh Z 键
          */
         KEY_Z = 90,
         /**
+         * @en The left meta key (CMD on macOS, Windows key on Windows)
+         * @zh 左 Meta 键（macOS 上的 CMD 键，Windows 上的 Windows 键）
+         */
+        META_LEFT = 91,
+        /**
+         * @en The right meta key (CMD on macOS, Windows key on Windows)
+         * @zh 右 Meta 键（macOS 上的 CMD 键，Windows 上的 Windows 键）
+         */
+        META_RIGHT = 93,
+        /**
          * @en The numeric keypad 0
          * @zh 数字键盘 0
          */
         NUM_0 = 96,

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