Add extended promotional component filter

[SimplyRayYZL]

Summary

• Adds extended_promotional into component catalog/search index materialization.
• Adds indexes and D1 search filtering via is_extended_promotional=true.
• Exposes the field in search API results and the HTML filter UI.
• Updates stale 7-Zip setup download URLs so the full setup path can still fetch 7zz during cache misses.
• Switches the Bun Test workflow to a small deterministic SQLite fixture DB, avoiding multi-GB upstream cache rebuilds in PR CI.
• Installs cf-proxy dependencies in the Bun Test workflow before running root-level tests.
• Keeps the derived-table setup helper from destroying the shared DB singleton used by route tests.

Validation

• npx --yes @biomejs/biome@1.9.4 check scripts/setup-7z.ts scripts/setup-test-db.ts lib/db/derivedtables/setup-derived-tables.ts
• JLCSEARCH_DB_PATH=.tmp/test-db.sqlite3 npx --yes bun run scripts/setup-test-db.ts && JLCSEARCH_DB_PATH=.tmp/test-db.sqlite3 npx --yes bun test
• npx --yes bun x tsc --noEmit
• git diff --check
• Verified current 7-Zip Linux x64, Linux ARM64, and macOS tarballs return HTTP 200.

/claim #92
Closes #92