refactor: Replace script-based litegraph preprocessing with integrated Playwright setup

- Remove prebuild-litegraph.js and restore-litegraph.js scripts
- Add i18nSetup.ts module for litegraph TypeScript 'declare' keyword preprocessing
- Create ComfyPageNoUser fixture to avoid user creation conflicts in i18n tests
- Update playwright.i18n.config.ts to use integrated setup/teardown
- Simplify collect-i18n command to just run Playwright tests
- Ensure pnpm collect-i18n works correctly

🤖 Generated with [Claude Code](https://claude.ai/code)

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

package.json

@@ -31,9 +31,7 @@
     "knip": "knip --cache",
     "knip:no-cache": "knip",
     "locale": "lobe-i18n locale",
-    "prebuild:litegraph": "node scripts/prebuild-litegraph.js",
-    "restore:litegraph": "node scripts/restore-litegraph.js",
-    "collect-i18n": "pnpm prebuild:litegraph && npx playwright test --config=playwright.i18n.config.ts; pnpm restore:litegraph",
+    "collect-i18n": "npx playwright test --config=playwright.i18n.config.ts",
     "json-schema": "tsx scripts/generate-json-schema.ts",
     "storybook": "nx storybook -p 6006",
     "build-storybook": "storybook build"