feat: keyword sets, sponsorship signals, and extractor/profile fixes

Add per-profile keyword sets, job source settings, sponsorship signal pills,
and several ATS extractors. Fix Hiring Cafe discovery via Next.js SSR search,
profile activate for comma-separated basicAuthUser aliases, and resume path
backfill migrations. Update settings and hiring-cafe docs; localhost compose
overlay for loopback-only deploys.

.gitignore

@@ -18,6 +18,11 @@ data/
 # Extractor storage outputs and cached auth (per-extractor runtime data)
 extractors/*/storage/
 
-# OS files
+# OS / editor
 .DS_Store
 Thumbs.db
+.vscode/
+
+# Local scratch / extractor debug dumps (not part of the app)
+storage/
+solution-workload-test.*