/en run the skill workflow
        │
        ▼
  Step 0 ── Disclaimer confirmation
        │
        ▼
  Step 1 ── Environment detection
             ├─ All ready (returning user) → Switch project, Rename accounts, or Full reset
             │   ├─ Switch project → Same account: skip to Step 4
             │   │                 → Switch account: Step 3 → Step 4
             │   └─ Rename accounts → Step R → Done
             └─ Not ready (first-time) → Continue full flow ↓
        │
        ▼
  Step 2 ── Check / auto-install gcloud CLI
        │
        ▼
  Step 3 ── GCP auth login
        │
        ▼
  Step 4 ── Get / Create GCP project
             ├─ Enter existing project ID
             └─ Auto-create via gcloud (detect billing → name → create → link)
        │
        ▼
  Step 5 ── GCP config + Gemini CLI deployment
             ├─ gcloud config set project
             ├─ Enable Vertex AI API
             ├─ gcloud auth application-default login (ADC)
             ├─ ~/.gemini/.env  (GOOGLE_CLOUD_PROJECT, GOOGLE_CLOUD_LOCATION)
             ├─ ~/.gemini/settings.json  (register Hook)  [first-time only]
             └─ ~/.gemini/hooks/vertex-ai-billing-switch-hook.mjs  [first-time only]
        │
        ▼
  Step 6 ── Verify all items → Done

Gemini CLI starts → SessionStart Hook fires
        │
        ▼
  Check current billing account status
        │
        ├─ OK ──────────────────────────────► Continue normally
        │
        └─ Quota exhausted / Account closed
                │
                ▼
          Scan all available billing accounts
                │
                ▼
          Switch to an available account
                │
                ▼
          Verify link success → Continue

VertexAiBillingSwitchSkill/
├── README.md                              # This file (English)
├── README.zh-TW.md                        # Traditional Chinese version
├── package.json                           # NPM package manifest
├── gemini-extension.json                  # Gemini CLI extension manifest
│
└── skills/                                # Gemini CLI Skills directory
    ├── en/       # English Skill
    │   ├── SKILL.md                       # Skill definition (loaded by Gemini CLI)
    │   ├── references/                    # On-demand reference docs
    │   │   ├── config-and-verify.md       # Config and Verification (Step 5 & 6)
    │   │   ├── install-gcloud.md          # Platform-specific gcloud installation
    │   │   ├── create-project.md          # Auto-create GCP project sub-flow
    │   │   ├── deploy-hook.md             # First-time Hook deployment
    │   │   └── rename-accounts.md         # Batch rename billing accounts
    │   ├── assets/
    │   │   └── vertex-ai-billing-switch-hook.mjs
    │   └── scripts/
    │       ├── install-gcloud.mjs
    │       └── consume-credits.mjs
    │
    └── zh-tw/    # Traditional Chinese Skill
        ├── SKILL.md                       # Skill 定義（由 Gemini CLI 載入）
        ├── references/                    # 按需讀取的參考文件
        │   ├── config-and-verify.md
        │   ├── install-gcloud.md
        │   ├── create-project.md
        │   ├── deploy-hook.md
        │   └── rename-accounts.md
        ├── assets/
        │   └── vertex-ai-billing-switch-hook.mjs
        └── scripts/
            ├── install-gcloud.mjs
            └── consume-credits.mjs

I want to add a [TARGET_LANGUAGE] translation of this Gemini CLI skill (language code: [LANG_CODE]).

## Files to translate
Translate the Markdown body (everything after the `---` frontmatter block) from English to [TARGET_LANGUAGE] for these files:
- `skills/en/SKILL.md`
- `skills/en/references/config-and-verify.md`
- `skills/en/references/deploy-hook.md`
- `skills/en/references/create-project.md`
- `skills/en/references/install-gcloud.md`
- `skills/en/references/rename-accounts.md`

## Rules — MUST follow
- Keep ALL code blocks (``` blocks) unchanged — do NOT translate code
- Keep ALL JSON objects unchanged — do NOT translate keys or values
- Keep ALL variable placeholders like `{home_dir}`, `{project_id}`, `{skill_dir}` unchanged
- Keep ALL markdown headings (##), tables, and formatting unchanged
- Only translate human-readable prose and UI strings (questions, labels, descriptions, and informational messages)

## After translating — apply these exact string replacements

In `SKILL.md` frontmatter, replace:
- `name: en` → `name: [LANG_CODE]`

In `SKILL.md` body, replace these 3 exact strings:
1. `{home_dir}/.gemini/skills/en` → `{home_dir}/.gemini/skills/[LANG_CODE]`
2. `/en run the skill workflow` → `/[LANG_CODE] [TRANSLATED_COMMAND]`
3. `` run `/en run the skill workflow` `` → `` run `/[LANG_CODE] [TRANSLATED_COMMAND]` ``

In `references/config-and-verify.md`, replace this exact string:
1. `/.gemini/skills/en` → `/.gemini/skills/[LANG_CODE]`

In `references/deploy-hook.md`, replace these 2 exact strings:
1. `extensions/VertexAiBillingSwitchSkill/skills/en` → `extensions/VertexAiBillingSwitchSkill/skills/[LANG_CODE]`
2. `/.gemini/skills/en` → `/.gemini/skills/[LANG_CODE]`

## Files to copy WITHOUT modification
Copy these files exactly as-is (do not translate):
- `skills/en/assets/vertex-ai-billing-switch-hook.mjs`
- `skills/en/scripts/install-gcloud.mjs`
- `skills/en/scripts/consume-credits.mjs`

## Output structure
Save everything under `skills/[LANG_CODE]/` with this exact structure:
```
skills/[LANG_CODE]/
├── SKILL.md
├── references/
│   ├── config-and-verify.md
│   ├── deploy-hook.md
│   ├── create-project.md
│   ├── install-gcloud.md
│   └── rename-accounts.md
├── assets/
│   └── vertex-ai-billing-switch-hook.mjs
└── scripts/
    ├── install-gcloud.mjs
    └── consume-credits.mjs
```

## Self-check before finishing
- [ ] `SKILL.md` frontmatter has `name: [LANG_CODE]`
- [ ] No occurrence of `skills/en` remains in any translated file
- [ ] No occurrence of `/en ` (as a skill command) remains in SKILL.md
- [ ] All `.mjs` files are identical to the originals in `skills/en/`