chore(zh-CN): complete Chinese translation - all missing keys and untranslated values

[LifetimeVip]

Summary

Complete Chinese (zh-CN) translation update: adds all missing keys and translates remaining English values to Chinese.

Changes by file

File	Changes
chat.json	Fixed 7 untranslated values (token stats, messages)
config.json	Added 16 missing keys (model loading options, preset saving)
developer.json	Fixed 1 untranslated label
models.json	Added 10 missing keys (model loading guardrails, memory warnings)
settings.json	Added model loading guardrails option
shared.json	Added beta label

Key areas now fully translated

• Model loading guardrails and memory warnings (models.json)
• LLM configuration options (numParallelSessions, useUnifiedKvCache, numCpuExpertLayersRatio in config.json)
• Preset save/management dialogs (config.json)
• Token/statistics display (chat.json)
• Model loader UI labels and hints

Verification

All 6 JSON files pass validation. Keys match the English source.

[github-actions]

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