Add extended promotional component flag

[Haenlein1]

What changed

• Adds a persisted/indexed is_extended_promotional component column derived from source metadata.
• Exposes is_extended_promotional in /components/list and /api/search responses and supports is_extended_promotional=true filtering.
• Carries the flag through the D1/cf-proxy component catalog and search index paths.
• Adds focused helper tests for promotional-extended metadata detection.

Why it fixes the issue

Issue #92 asks for extended promotional parts to be available in a filterable column. This adds that column during DB optimization, keeps it indexed for filtering, and makes the field available through both the legacy app routes and the Cloudflare proxy/search paths.

Tested

• npx @biomejs/biome format --write on touched files
• npx tsc --noEmit
• cd cf-proxy && npx tsc --noEmit
• git diff --check

Limitations

• cf-proxy Vitest startup is blocked in my local Windows workspace by the Cloudflare/Vitest worker loader resolving the username path with a space; the suite starts after optional native dependencies are installed but fails before collecting tests.
• Root Bun tests were not run because Bun is not installed in this environment.

/claim #92

Bounty: #92

[Haenlein1]

CI status update:

• Format Check: passing
• Type Check: passing
• Bun Test: failing before tests run during setup, at scripts/setup-7z.ts with Failed to download: Not Found

This looks like the setup dependency download step rather than a test failure from this PR's code path.

[Haenlein1]

Follow-up pushed in c5d4fcb.

What changed:

• Updated scripts/setup-7z.ts from removed 7z2408 artifacts to current 7z2601 artifacts. I verified the old Linux x64 URL returns 404 and the new Linux x64/Linux arm64/mac URLs return 200.
• Hardened the DB optimization guard to check pragma_table_info('components') for is_extended_promotional instead of probing the column with a select.

Local verification:

• npx biome format --write scripts/setup-7z.ts lib/db/optimizations/component-extended-promotional-column.ts
• npx biome format scripts/setup-7z.ts lib/db/optimizations/component-extended-promotional-column.ts
• npx --yes --package typescript tsc --noEmit --types bun
• cd cf-proxy && npx tsc --noEmit

One local limitation: cd cf-proxy && npm test still fails in this Windows workspace before collecting tests because the Cloudflare/Vitest worker resolves a path with the space in C:\Users\jj haenlein incorrectly (.../vitest/dist/file:/C:/Users/jj%20haenlein/.../threads.js).