feat(i18n): add internationalization with vue-i18n and translate codebase to English

[ChinmayShringi]

Summary

• Add vue-i18n with runtime language switching (zh/en) using $t() translation keys across all frontend components and views
• Pass language parameter through backend APIs (ontology generation, simulation config, profile generation) for localized output
• Translate all Chinese comments, docstrings, error messages, log messages, and configuration descriptions to English across 43+ files (backend APIs, utilities, scripts, config/deploy files, and frontend)

Test plan

• Verify frontend renders correctly in English (default)
• Verify frontend renders correctly in Chinese when locale is switched
• Test ontology generation with language=en and language=zh
• Test simulation preparation with both language options
• Verify backend API error messages return in English
• Run existing test suite to ensure no regressions

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Original PR: 666ghj/MiroFish#189
Original Author: @ysfbsf