feat: add unified memory routing to consolidation service

- Add MemoryRouteClassification and MemoryRoutingResult models
- Implement unified classifier (_classify_web_results_unified) that routes
  web results to: wiki, volatile, file (Paperless), prefetch, or skip
- Add routing methods: _route_to_volatile, _route_to_files, _register_prefetch
- Update _process_search to use unified classifier instead of separate analysis
- Add get_volatile_cache_service factory to dependencies
- Wire volatile_service and settings_client into ConsolidationService
- Update ConsolidationResult/Response with new routing counters

Test fixes:
- Fix WikiJSClient fixtures to use api_token instead of username/password
- Fix entity linking test assertions to expect full user-namespaced paths
- Add sample_unified_classification fixture for new classifier format

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/core/dependencies.py

@@ -597,7 +597,9 @@ def get_consolidation_service() -> "ConsolidationService":
         ollama=get_ollama_client(),
         wiki=get_wikijs_client(),
         settings=get_settings(),
-        ingestion_service=get_ingestion_service()
+        ingestion_service=get_ingestion_service(),
+        volatile_service=get_volatile_cache_service(),
+        settings_client=get_settings_client(),
     )
 
 
@@ -638,6 +640,17 @@ def get_rag_search_service() -> "RAGSearchService":
     )
 
 
+@lru_cache
+def get_volatile_cache_service() -> "VolatileCacheService":
+    """Get VolatileCacheService singleton."""
+    from src.services.volatile_service import VolatileCacheService
+    return VolatileCacheService(
+        qdrant_client=get_qdrant_client(),
+        ollama_client=get_ollama_client(),
+        settings=get_settings()
+    )
+
+
 # Authentication
 from fastapi import Security, HTTPException
 from fastapi.security import HTTPBearer