feat(suggest): add base item selection and 3-look comparison view

[AmitayAbudy]

Summary

Improves the outfit suggestion experience by adding:

1. Base Item Selection: The option to generate complete outfits centered around a specific piece of clothing (e.g. a favorite shirt, pants, or shoes).
2. 3-Look Comparison View: The option to switch between Look 1 / Look 2 / Look 3 tabs or view all 3 AI-generated outfit suggestions simultaneously in a side-by-side comparison grid, rather than needing to view and discard them sequentially.

Features & Changes

• Backend API (POST /api/v1/outfits/suggest-options):
  • Adds endpoint to generate and materialize all 3 AI outfit recommendations in a single request.
  • Supports include_items: list[UUID] in suggestion requests, forcing the AI prompt and outfit assembler to include the selected item(s).
  • Enforces mandatory item retention during body-slot deduplication and canonical outfit sorting.
  • Updates suggestion cache key (suggest:{user_id}:{occasion}:{sorted_item_ids}) and FIFO pop to isolate suggestions with specific base items.
  • Adds recency combination filtering to avoid repeating recently suggested looks across alternatives.
• Frontend Dashboard (/dashboard/suggest):
  • Adds a base item picker card and dialog with category filtering (shirts, pants, shoes, etc.) to choose a piece to build outfits around.
  • Adds a "Create outfit with this item" quick action in the wardrobe item details modal (item-detail-dialog.tsx) that routes directly to /dashboard/suggest?item=<id>.
  • Introduces Look 1 / Look 2 / Look 3 tabs for instant switching between alternatives.
  • Adds a "Compare All" toggle button that expands the view into a 3-column side-by-side comparison grid with individual "Choose This" actions.
• Internationalization (i18n):
  • Added full translation coverage for all new UI strings across all 8 supported locales (en, de, fr, it, ja, ko, zh-CN, zh-TW). Verified with npm run i18n:check.
• Testing:
  • Added unit and integration tests for include_items enforcement, suggest-options batch endpoint, body-slot overrides, and suggestion cache isolation.

Verification

• npm run build in frontend/ succeeds cleanly.
• npm run i18n:check passes with 0 missing keys / errors across all 8 locales.
• All 71 backend tests pass in test_clothing_utils.py, test_suggestion_cache.py, and test_recommendation_service.py.

Summary by Sourcery

Improve outfit suggestions by supporting base-item-driven recommendations and comparison of three generated looks.

New Features:

• Enable outfit suggestions to be generated around a selected wardrobe item.
• Provide three generated outfit options with tabbed navigation and side-by-side comparison.

Bug Fixes:

• Ensure selected base items are retained during outfit assembly and body-slot deduplication.
• Prevent suggestion-cache variants from mixing across different base-item selections.
• Avoid repeating recently suggested outfit combinations.

Enhancements:

• Add a wardrobe-item quick action that opens outfit suggestions with that item preselected.
• Preserve the existing single-outfit suggestion API while supporting batched recommendation generation.

Tests:

• Add coverage for mandatory item enforcement, multi-option suggestions, cache isolation, and bulk deletion limits.

Chores:

• Add translations for the new suggestion and wardrobe actions across all supported locales.