test: update fixtures to use real service host

- Add TEST_HOST config (default: 192.168.86.149) in conftest.py
- Update all test fixtures to use configurable host instead of
  docker hostnames (neo4j, qdrant, wiki, etc.)
- Fix test_integration.py WikiJS client to use username/password auth
- Fix ollama_client fixture to use ollama_embedding_model setting

This allows tests to run against real services from outside Docker.

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

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

tests/test_entity_linking.py

@@ -38,10 +38,10 @@ def settings():
 
 
 @pytest_asyncio.fixture
-async def neo4j_client(settings) -> AsyncGenerator[Neo4jClient, None]:
+async def neo4j_client(settings, neo4j_test_uri) -> AsyncGenerator[Neo4jClient, None]:
     """Get connected Neo4j client."""
     client = Neo4jClient(
-        uri=settings.neo4j_uri,
+        uri=neo4j_test_uri,
         user=settings.neo4j_user,
         password=settings.neo4j_password
     )
@@ -51,12 +51,12 @@ async def neo4j_client(settings) -> AsyncGenerator[Neo4jClient, None]:
 
 
 @pytest_asyncio.fixture
-async def wiki_client(settings) -> AsyncGenerator[WikiJSClient, None]:
+async def wiki_client(wikijs_test_config) -> AsyncGenerator[WikiJSClient, None]:
     """Get Wiki.js client."""
     client = WikiJSClient(
-        base_url=settings.wikijs_url,
-        username=settings.wikijs_username,
-        password=settings.wikijs_password
+        base_url=wikijs_test_config["base_url"],
+        username=wikijs_test_config["username"],
+        password=wikijs_test_config["password"]
     )
     yield client