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>

tests/test_integration.py

@@ -53,8 +53,7 @@ async def wikijs_client(wikijs_test_config) -> AsyncGenerator[WikiJSClient, None
     """Get Wiki.js client."""
     client = WikiJSClient(
         base_url=wikijs_test_config["base_url"],
-        username=wikijs_test_config["username"],
-        password=wikijs_test_config["password"]
+        api_token=wikijs_test_config["api_token"]
     )
     yield client
     await client.close()