chore: implement repo improvements plan (npm scripts, docs, catalog CI, i18n, validator)

- Add npm scripts: validate, validate:strict, index, readme, chain, catalog, build
- Align docs to V4 and 560 skills (GETTING_STARTED, FAQ, BUNDLES, MAINTENANCE, vietnamese)
- build-catalog: output to data/ for catalog, bundles, aliases; add to CI and drift check
- Add yaml dep, Node setup and catalog step in CI; extend auto-commit and drift msg
- Translate CI and MAINTENANCE to English; update CI_DRIFT_FIX and maintenance routine
- QUALITY_BAR/CONTRIBUTING: canonical validator npm run validate; legacy note in validate-skills.js

docs/FAQ.md

@@ -11,7 +11,7 @@
 Skills are specialized instruction files that teach AI assistants how to handle specific tasks. Think of them as expert knowledge modules that your AI can load on-demand.
 **Simple analogy:** Just like you might consult different experts (a lawyer, a doctor, a mechanic), these skills let your AI become an expert in different areas when you need them.
 
-### Do I need to install all 552+ skills?
+### Do I need to install all 560+ skills?
 
 **No!** When you clone the repository, all skills are available, but your AI only loads them when you explicitly invoke them with `@skill-name`.
 It's like having a library - all books are there, but you only read the ones you need.
@@ -41,7 +41,7 @@ The skill files themselves are stored locally on your computer, but your AI assi
 
 ---
 
-## 🔒 Security & Trust (V3 Update)
+## 🔒 Security & Trust (V4 Update)
 
 ### What do the Risk Labels mean?
 
@@ -156,7 +156,7 @@ Include:
 
 ### My PR failed "Quality Bar" check. Why?
 
-V3 introduces automated quality control. Your skill might be missing:
+V4 introduces automated quality control. Your skill might be missing:
 
 1. A valid `description`.
 2. Usage examples.