Add extended promotional component filter

[hanjav]

/claim #92

Summary

• Add is_extended_promotional as a response field derived from preferred && !basic
• Add is_extended_promotional=true filtering to /api/search, /components/list, and the Cloudflare proxy search path
• Add the filter control to the rendered components list UI
• Keep the shared Bun test DB connection alive when derived tables are prepared in test preload
• Cover the new field/filter in route tests
• Update the 7-Zip setup URLs to the current upstream release so the database setup job can download 7zz

Testing

• .\node_modules\.bin\biome.cmd check routes\components\list.tsx routes\api\search.tsx cf-proxy\src\search.ts cf-proxy\src\components.ts cf-proxy\src\index.ts cf-proxy\src\render.ts tests\routes\components\list.test.ts tests\routes\api\search.test.ts tests\preload.ts
• .\node_modules\.bin\biome.cmd check --write scripts\setup-7z.ts
• npx.cmd --yes -p typescript@~5.6.2 tsc --noEmit
• npx.cmd --yes bun test tests\routes\components\list.test.ts tests\routes\api\search.test.ts

[hanjav]

Quick CI note: the cancelled Bun Test run looks like a workflow timeout during DB setup rather than a test failure. The run successfully downloaded/extracted the DB cache and completed several setup-db-optimizations steps before GitHub cancelled it at the 20-minute job timeout. I verified this PR locally with: format check on the changed files, TypeScript type-check, and the targeted Bun route tests for components/list + api/search (11 passing).