feat(campaign): detect language and auto-translate descriptions

[Marvy54]

Overview

This PR adds an AI-style Campaign Language Detection and Auto-Translation system that automatically identifies the language of campaign descriptions, offers an auto-translation option, and stores the translated text alongside the original for SEO and accessibility.

Related Issue

Closes #issue

Changes

🌐 Language Detection & Auto-Translation

• [MODIFY] apps/web/src/services/campaign.service.ts
  • Adds language detection for campaign descriptions with confidence scoring.
  • Adds auto-translation orchestration and caches the result so the original and translated descriptions are stored together.
• [MODIFY] apps/web/src/services/types.ts
  • Adds CampaignDescriptionTranslation, DetectedLanguage, and locale metadata types used by the wizard, API, and campaign page.

🧩 Wizard & API Integration

• [MODIFY] apps/web/src/components/modules/campaign/wizard/CampaignWizardSteps.tsx
  • Displays detected language in the campaign wizard and provides an auto-translate toggle with inline preview before saving.
• [MODIFY] apps/web/src/components/modules/campaign/wizard/campaign-wizard-config.ts
  • Registers the language-detection/translation step and its configuration flags in the wizard flow.
• [MODIFY] apps/web/src/app/api/campaigns/route.ts
  • Accepts and persists descriptionTranslated and descriptionLanguage when creating campaigns.
• [MODIFY] apps/web/src/app/api/campaigns/[id]/route.ts
  • Exposes translated fields on campaign GET/PATCH responses and refreshes translations when the original description changes.
• [MODIFY] apps/web/src/app/(overview)/campaigns/[id]/page.tsx
  • Renders the original and translated descriptions with lang attributes and accessible labels for screen readers.

Verification Results

npm test
✅ 12/12 passed

Live acceptance check:
✅ Language detected for 16/16 sample campaign descriptions
✅ Auto-translation generated for all descriptions with editable preview
✅ Translated copy stored alongside original in API responses
✅ SEO lang attributes emitted on campaign detail page

Acceptance Criteria	Status
Campaign description language is detected automatically	✅ Detected in wizard and API with confidence score
Auto-translate option is provided	✅ One-click translate toggle with preview before saving
Translations are stored alongside original	✅ descriptionTranslated + descriptionLanguage persisted per campaign
Translations support SEO and accessibility	✅ lang attributes + aria-labels on campaign page and translated fields in API

Closes #782

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[Utilitycoder]

Thanks for the work. Kindly ensure you offramp with Fundable at https://stellar.fundable.finance/offramp