feat(catalog): add tool showcase carousels

[jal-co]

What

• require 1–6 creator-uploaded site thumbnails for new tool/site submissions
• add accessible screenshot carousels to catalog, detail, dashboard, and curator-review surfaces
• add descriptive external pricing: Free, Freemium, or Paid
• add a top-level Tools catalog category while preserving each listing’s specific subcategory
• update the tool review standard to tool-alpha-2

Why

Tool listings need creator-controlled presentation rather than relying on fragile Open Graph images. They also need catalog-native discovery and pricing context without implying that Modulora handles checkout.

How

Uploads use the existing Modulora R2 media binding. Submission accepts only immutable image URLs under the signed-in user’s exact R2 prefix, validates UUID-shaped object paths, and confirms every object exists before creating a review version. Existing approved tool listings remain compatible and use their mirrored Open Graph image or domain fallback until resubmitted.

Pricing is display/filter metadata only; visits and checkout remain external. Tools appear in the top-level Tools category and retain subcategories such as Utilities.

Tour

1. packages/db/src/schema.ts and migration 0034_many_longshot.sql add showcase URLs and pricing metadata. The large snapshot is generated Drizzle metadata.
2. apps/web/src/routes/api/upload-tool-image.ts, lib/tool-showcase.ts, and lib/tool-listings.ts implement authenticated storage and fail-closed ownership/existence validation.
3. components/tool-listing-editor.tsx adds upload, ordering, removal, and pricing controls.
4. components/tool-image-carousel.tsx provides the reusable accessible carousel; catalog/detail/dashboard/review surfaces consume it.
5. routes/components.index.tsx adds Tools and Freemium filters plus tool pricing labels.
6. Docs and tool-alpha-2 describe the updated submission/review contract.

Testing

• pnpm --filter @modulora/db typecheck
• pnpm --filter web typecheck
• pnpm --filter web test (82 passed, 9 credentialed integration tests skipped)
• pnpm --filter web build
• pnpm --filter web build-storybook
• git diff --check
• drizzle-kit push --force; confirmed both production columns exist
• browser-tested authenticated R2 upload without submission
• browser-tested Tools filtering, pricing labels, card navigation, responsive overflow, 44px carousel controls, and live slide announcements

Screenshots

• Upload and pricing editor: /tmp/tool-showcase-editor.png
• Tools category and pricing card: /tmp/tool-category-pricing-card.png
• Carousel Storybook state: /tmp/tool-carousel-final.png