enhance(backend): pugをやめ、JSXベースのテンプレートに変更 (#16908)

* enhance(backend): pugをやめ、JSXベースのテンプレートに変更 (to misskey-dev dev branch) (#16889)

* wip

* wip

* wip

* wip

* fix lint

* attempt to fix test

* fix

* fix

* fix: oauthページの描画がおかしい問題を修正

* typo [ci skip]

* fix

* fix

* fix

* fix

* fix

* refactor

* fix

* fix

* fix broken lockfile

* fix: expose supported languages as global variable

* remove i18n package from root as it is no longer required [ci skip]

* fix

* fix: add i18n package.json to Docker target-builder stage for federation tests (#16909)

* Initial plan

* fix: add i18n package.json to Docker target-builder stage for federation tests

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* fix: followup-test-federation for enh-remove-pug (#16910)

* fix: followup-test-federation for enh-remove-pug

* Revert "fix: add i18n package.json to Docker target-builder stage for federation tests (#16909)"

This reverts commit 14313468d34f49c363eef4d0a932e9fc0d9a37fb.

* fix: CSSが読み込まれない場合がある問題を修正

* fix [ci skip]

* fix: propsのデフォルト値をnull合体演算子から論理和演算子に変更（空文字に対処するため）

* remove @types/pug

* enhance: bootloaderを埋め込むように

* fix possible race condition

* remove esbuild

---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>
Co-authored-by: おさむのひと <46447427+samunohito@users.noreply.github.com>

packages/backend/src/misc/json-stringify-html-safe.ts

@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+const ESCAPE_LOOKUP = {
+	'&': '\\u0026',
+	'>': '\\u003e',
+	'<': '\\u003c',
+	'\u2028': '\\u2028',
+	'\u2029': '\\u2029',
+} as Record<string, string>;
+
+const ESCAPE_REGEX = /[&><\u2028\u2029]/g;
+
+export function htmlSafeJsonStringify(obj: any): string {
+	return JSON.stringify(obj).replace(ESCAPE_REGEX, x => ESCAPE_LOOKUP[x]);
+}