feat(marketing-pages): add OttaORM marketing pages, admin builder, worker APIs, and Next.js rendering

[thinkdj]

Motivation

• Provide a DB-driven, drag-and-drop marketing/homepage builder so SaaS founders can create landing pages quickly.
• Allow apps to "register" blocks (hardcoded in this PR) and make them discoverable to the admin palette and public rendering.
• Integrate with existing OttaORM/slot patterns so pages can be authored in the TanStack admin and rendered in both TanStack and Next.js homepage apps.

Description

• Added Drizzle/OttaORM schema and models for marketing pages (pages, page_sections, page_features, page_actions) at ottabase/models/MarketingPage*.ts and exported tables in ottabase/db/schema.ts.
• Implemented model classes (MarketingPage, PageSection, PageFeature, PageAction) and registered them in worker/lib/db-utils.ts so generic OttaORM CRUD endpoints work.
• Added worker read endpoints and a block registry in worker/routes/marketing-pages.ts and wired routes into the worker router (/api/blocks, /api/pages/nav, /api/pages/:slug).
• Added TanStack admin UI pages: /admin/pages list (AdminPagesListPage.tsx) and /admin/pages/$pageId builder (AdminPageBuilderPage.tsx) with a block palette, drag/drop canvas (native DnD handlers for MVP), inline editor, features/actions creation, and duplicate/delete flows.
• Exposed a public TanStack route /pages/$slug (MarketingPageRenderer.tsx) for preview/live rendering and added a Next.js dynamic route app/[slug]/page.tsx + MarketingPageContent that fetches the worker API for static params + preview rendering.
• Added client hooks and types (src/hooks/marketingPageHooks.ts, src/types/marketing-pages.ts) and a small Vitest route-level test for the block registry (worker/routes/__tests__/marketing-pages.test.ts).
• Documented the feature in both apps' READMEs and added an admin entry for "Marketing Pages" in the Admin Console.
• Notes: run the OttaORM init endpoint to apply DB migrations: curl -X POST http://localhost:3004/api/ottaorm/init.

Testing

• Ran TypeScript check for the TanStack app with pnpm --filter @ottabase/ottabase-template-app-tanstack type-check, which failed due to many pre-existing workspace-wide type/import issues that are unrelated to this feature and prevented a clean type-check.
• Ran the TanStack app tests targeting the new route-level test with pnpm --filter @ottabase/ottabase-template-app-tanstack test -- worker/routes/__tests__/marketing-pages.test.ts, but Vitest bootstrap failed early due to existing package resolution/type setup problems in the monorepo; the new test file is present and intended to pass once the workspace test bootstrap issues are resolved.
• A new route-level test was added at apps/ottabase-template-app-tanstack/worker/routes/__tests__/marketing-pages.test.ts and the feature code is under apps/ottabase-template-app-tanstack/ottabase/models/MarketingPage*, worker/routes/marketing-pages.ts, and admin UI under src/pages/admin/pages/.

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