chore(i18n): generate JSON Schema for locale files

Generate a JSON Schema from the canonical `en.json` that provides some cool editor DX niceties
(autocomplete, typo detection via `additionalProperties: false`) for all i18n locale files.

- Add `scripts/generate-i18n-schema.ts` to generate `i18n/schema.json` from en.json. This is a JSON
  Schema... schema.
- Add `"$schema"` reference to this schema to all 27 locale files
- Add `pnpm i18n:schema` and run it in the pre-commit hook (updates schema) and in CI (fails if
  schema is out of date)

Note: in the pre-commit hooks I called the node script directly because pnpm adds a ~250ms overhead
(on my machine) and it's important for DX for these hooks to be fast.

Author: serhalp

.github/workflows/ci.yml

@@ -235,3 +235,8 @@ jobs:
 
       - name: 🌐 Check for missing or dynamic i18n keys
         run: pnpm i18n:report
+
+      - name: 🌐 Check i18n schema is up to date
+        run: |
+          pnpm i18n:schema
+          git diff --exit-code i18n/schema.json

i18n/locales/ar-EG.json

@@ -1 +1,3 @@
-{}
+{
+  "$schema": "../schema.json"
+}

i18n/locales/ar.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "../schema.json",
   "seo": {
     "home": {
       "title": "npmx - متصفح الحزم لسجل npm",

i18n/locales/az-AZ.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "../schema.json",
   "seo": {
     "home": {
       "title": "npmx - npm Reyestri üçün Paket Brauzeri",

i18n/locales/cs-CZ.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "../schema.json",
   "seo": {
     "home": {
       "title": "npmx - Prohlížeč balíčků pro registr npm",

i18n/locales/de-DE.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "../schema.json",
   "seo": {
     "home": {
       "title": "npmx - Paket-Browser für die npm Registry",

i18n/locales/en-GB.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "../schema.json",
   "settings": {
     "tagline": "customise your npmx experience",
     "clear_accent": "Clear accent colour"

i18n/locales/en-US.json

@@ -1 +1,3 @@
-{}
+{
+  "$schema": "../schema.json"
+}

i18n/locales/en.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "../schema.json",
   "seo": {
     "home": {
       "title": "npmx - Package Browser for the npm Registry",

i18n/locales/es-419.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "../schema.json",
   "built_at": "generado {0}",
   "alt_logo": "logo de npmx",
   "connector": {