feat(insight): add multi-language support for insight reports

[BingqingLyu]

What this PR does

This PR implements multi-language support for the /insight HTML report, addressing issue QwenLM#2022.

Changes Made

1. LLM-generated content localization

   • Modified DataProcessor.ts to pass user language setting to LLM prompts
   • All qualitative insights (impressive_workflows, friction_points, etc.) are now generated in the user's preferred language

2. Static text localization

   • Created i18n.ts with translations for 6 languages (en, zh, ja, de, pt, ru)
   • Updated React components (Header.tsx, Qualitative.tsx) to use translations
   • All section headings, labels, and UI text are now localized

3. Language indication

   • Added a message displaying which language is being used when generating insights
   • Message: "Generating insights in {{language}}..."

4. HTML lang attribute

   • Set the HTML lang attribute based on user's language setting
   • Improves accessibility and browser language handling

Supported Languages

• English (en)
• 中文 (zh)
• 日本語 (ja)
• Deutsch (de)
• Português (pt)
• Русский (ru)

Testing

• Build passes successfully
• All eslint checks pass
• TypeScript compilation successful

Related Issue

Closes QwenLM#2022

[BingqingLyu]

Conflict Group 2

This PR shares modified functions with 1 other PR(s): #108.

These PRs should be reviewed as a batch — merging one may affect the others.

Function	File	Also modified by
AtAGlance	Qualitative.tsx	#108
NavToc	Qualitative.tsx	#108
analyzeSession	DataProcessor.ts	#108
generateQualitativeInsights	DataProcessor.ts	#108

graph LR
    PR45["PR #45"]
    FAtAGlance_7020["AtAGlance<br>Qualitative.tsx"]
    PR45 -->|modifies| FAtAGlance_7020
    PR108["PR #108"]
    PR108 -->|modifies| FAtAGlance_7020
    FNavToc_7020["NavToc<br>Qualitative.tsx"]
    PR45 -->|modifies| FNavToc_7020
    PR108 -->|modifies| FNavToc_7020
    FanalyzeSession_8719["analyzeSession<br>DataProcessor.ts"]
    PR45 -->|modifies| FanalyzeSession_8719
    PR108 -->|modifies| FanalyzeSession_8719
    FgenerateQualitativeInsights_8719["generateQualitativeInsights<br>DataProcessor.ts"]
    PR45 -->|modifies| FgenerateQualitativeInsights_8719
    PR108 -->|modifies| FgenerateQualitativeInsights_8719

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