feat: Remove Document collection from schema

BREAKING CHANGE: Document collection removed from Weaviate schema

Architecture simplification:
- Removed Document collection (unused by Flask app)
- All metadata now in Work collection or file-based (chunks.json)
- Simplified from 4 collections to 3 (Work, Chunk_v2, Summary_v2)

Schema changes (schema.py):
- Removed create_document_collection() function
- Updated verify_schema() to expect 3 collections
- Updated display_schema() and print_summary()
- Updated documentation to reflect Chunk_v2/Summary_v2

Ingestion changes (weaviate_ingest.py):
- Removed ingest_document_metadata() function
- Removed ingest_document_collection parameter
- Updated IngestResult to use work_uuid instead of document_uuid
- Removed Document deletion from delete_document_chunks()
- Updated DeleteResult TypedDict

Type changes (types.py):
- WeaviateIngestResult: document_uuid → work_uuid

Documentation updates (.claude/CLAUDE.md):
- Updated schema diagram (4 → 3 collections)
- Removed Document references
- Updated to reflect manual GPU vectorization

Database changes:
- Deleted Document collection (13 objects)
- Deleted Chunk collection (0 objects, old schema)

Benefits:
- Simpler architecture (3 collections vs 4)
- No redundant data storage
- All metadata available via Work or file-based storage
- Reduced Weaviate memory footprint

Migration:
- See DOCUMENT_COLLECTION_ANALYSIS.md for detailed analysis
- See migrate_chunk_v2_to_none_vectorizer.py for vectorizer migration

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -45,4 +45,4 @@ vectorize_remaining.py
 migrate_chunk_*.py
 
 # Archives (migration scripts moved here)
-archive/
+archive/chunk_v2_backup.json