[codex] Fix locale picker metadata

[hxy91819]

Summary

• Add Hindi and Russian locale labels and flags to the docs-site locale metadata.
• Centralize locale flag metadata in config.mjs so the picker uses the same locale configuration source as labels.
• Add smoke coverage that fails when an active locale is missing a label or flag, and asserts Hindi/Russian render in the picker.

Root cause

docs/docs.json includes hi and ru, but the docs-site build metadata did not include those locale labels or flags. The language picker therefore fell back to 🌐 for the icon and the raw locale code for the display label.

Validation

• npm run docs:build:shell && npm run docs:smoke:shell
• node --check scripts/docs-site/build.mjs && node --check scripts/docs-site/config.mjs && node --check scripts/docs-site/smoke.mjs
• npm test
• Confirmed generated dist/docs-site/index.html contains 🇮🇳 हिन्दी and 🇷🇺 Русский.

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