fix(docker): copy full extractors tree into image for runtime manifests

The Dockerfile only copied a fixed list of extractor dirs; new sources
were listed in shared but their manifest.ts files were absent from the
container, so discovery logged missingManifest in production.

Copy extractors/ once before npm install in builder and production, and
skip redundant per-extractor COPY lines. Add extractors/*/storage/ to
.dockerignore to avoid baking local cache into the build context.

Co-authored-by: Cursor <cursoragent@cursor.com>

.dockerignore

@@ -10,6 +10,9 @@
 # Data (mounted as volume)
 data/
 
+# Extractor runtime caches (optional local dirs; never needed in image)
+extractors/*/storage/
+
 # Environment files (passed via docker-compose)
 .env
 **/.env