feat(hltv): add HLTV adapters

[CrazysCodes]

Description

Add a new read-only HLTV adapter for CS2/CS:GO data. It supports searching HLTV entities and reading structured player, match, team, event, map-pool, form, duel, and series stats from visible HLTV pages.

The adapter uses Browser/UI parsing because HLTV does not expose a stable public JSON API for these stats views.

Related issue: N/A

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 🌐 New site adapter
• 📝 Documentation
• ♻️ Refactor
• 🔧 CI / build / tooling

Checklist

• I ran the checks relevant to this PR
• I updated tests or docs if needed
• I included output or screenshots when useful

Documentation (if adding/modifying an adapter)

• Added doc page under docs/adapters/ (if new adapter)
• Updated docs/adapters/index.md table (if new adapter)
• Updated sidebar in docs/.vitepress/config.mts (if new adapter)
• Updated README.md / README.zh-CN.md when command discoverability changed
• Used positional args for the command's primary subject unless a named flag is clearly better
• Normalized expected adapter failures to CliError subclasses instead of raw Error

Screenshots / Output

Checks run locally:

node --check clis/hltv/*.js
node scripts/check-silent-column-drop.mjs
node scripts/check-typed-error-lint.mjs
npx tsc --noEmit
npm run build
npm run docs:build

All checks passed.

Smoke test:

env HOME=/private/tmp/opencli-pr-home node dist/src/main.js hltv search niko --limit 1 -f json

Sample output:

[
  {
    "rank": 1,
    "type": "player",
    "id": "3741",
    "name": "Nikola 'NiKo' Kovač",
    "title": null,
    "date": null,
    "author": null,
    "url": "https://www.hltv.org/player/3741/niko"
  }
]

Notes:

• HOME=/private/tmp/opencli-pr-home was used only to isolate this branch from my local ~/.opencli/clis/hltv development adapter.
• Heavier browser smoke tests may take longer due to HLTV/Cloudflare/browser-session behavior, but the adapter builds, type-checks, renders docs, and the lightweight search smoke test succeeds.