ci(client): add Crowdin translation workflow

Establish native GitHub synchronization, scoped translation PR checks, locale safeguards, semantic-release handling, and contributor guidance.

commitlint.config.cjs

@@ -1,7 +1,11 @@
 module.exports = {
   extends: ["@commitlint/config-conventional"],
   rules: {
-    "type-enum": [2, "always", ["feat", "fix", "db", "perf", "refactor", "style", "docs", "test", "build", "ci", "chore", "security", "revert"]],
+    "type-enum": [
+      2,
+      "always",
+      ["feat", "fix", "i18n", "db", "perf", "refactor", "style", "docs", "test", "build", "ci", "chore", "security", "revert"],
+    ],
     "header-max-length": [2, "always", 100],
     "body-max-line-length": [2, "always", 500],
     "subject-full-stop": [2, "never", "."],