refactor: move i18n formatting to workspace root (#28360)

refactor: move i18n formatting to project root

i18n/.prettierrc

@@ -1,5 +0,0 @@
-{
-  "jsonRecursiveSort": true,
-  "jsonSortOrder": "{\"/.*/\": \"lexical\"}",
-  "plugins": ["prettier-plugin-sort-json"]
-}

i18n/package.json

@@ -1,13 +0,0 @@
-{
-  "name": "immich-i18n",
-  "version": "2.7.5",
-  "private": true,
-  "scripts": {
-    "format": "prettier --cache --check .",
-    "format:fix": "prettier --cache --write --list-different ."
-  },
-  "devDependencies": {
-    "prettier": "^3.7.4",
-    "prettier-plugin-sort-json": "^4.1.1"
-  }
-}