[do-io]

Summary

Adds schemas for the remaining 21 slot types, so the drag-and-drop editor can edit all 29 (it could edit 8).

• Each schema follows what the slot's Blade view actually reads; the existing Filament blocks were the reference for labels and placeholders.
• New tags field type for lists of strings (pricing tier features, data-table headers and cells). The editor shows it as a textarea with one value per line; Filament gets a TagsInput. Schema VERSION is now 2.
• The Filament blocks of the new types are built by SchemaBlockFactory, so the form and the editor share one description (about 700 lines of hand-written blocks removed).
• SlotSchemaRegistry::for() now returns a non-null SlotSchema. A test fails if a type is added to the enum without a schema.

Behaviour changes to review

• order_receipt: the old Filament block saved name/quantity/price/total, but the view reads item/qty/unit_price/grand_total/notes. The schema follows the view, so data stored under the old keys will no longer render.
• order_receipt.status and rss_feed.feed_url are dropped: no view reads them.
• New fields exposed that views already read: image URLs on two_column, and advanced style fields such as bg_color.
• A new Data Table starts with three empty rows (cells has no default).

Test plan

• vendor/bin/pest (113 tests)
• npm run test:js (24 tests)
• vendor/bin/phpstan analyse, vendor/bin/pint --test
• Workbench demo: palette lists 29 blocks; added Pricing Grid, Data Table, Testimonial and Order Receipt; preview renders with no errors; editing a tags field updates the document and the preview

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