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/conftest.py

@@ -1,5 +1,6 @@
 """Pytest configuration and shared fixtures for Library Desk tests."""
 
+import os
 import pytest
 import pytest_asyncio
 from typing import AsyncGenerator
@@ -7,6 +8,9 @@ from typing import AsyncGenerator
 # Test configuration
 pytest_plugins = ("pytest_asyncio",)
 
+# Use real host for tests (services available at this IP)
+TEST_HOST = os.environ.get("TEST_HOST", "192.168.86.149")
+
 
 @pytest.fixture
 def test_user() -> str:
@@ -17,49 +21,56 @@ def test_user() -> str:
 @pytest.fixture
 def neo4j_test_uri() -> str:
     """Test Neo4j URI."""
-    return "bolt://neo4j:7687"
+    return f"bolt://{TEST_HOST}:7687"
 
 
 @pytest.fixture
 def neo4j_test_auth() -> tuple:
     """Test Neo4j authentication."""
-    return ("neo4j", "test_password")
+    from src.config import get_settings
+    settings = get_settings()
+    return ("neo4j", settings.neo4j_password)
 
 
 @pytest.fixture
 def qdrant_test_url() -> str:
     """Test Qdrant URL."""
-    return "http://qdrant:6333"
+    return f"http://{TEST_HOST}:6333"
 
 
 @pytest.fixture
 def wikijs_test_config() -> dict:
     """Test Wiki.js configuration."""
+    from src.config import get_settings
+    settings = get_settings()
     return {
-        "base_url": "http://wiki:3000",
-        "api_key": "test_api_key"
+        "base_url": f"http://{TEST_HOST}:3000",
+        "username": settings.wikijs_username,
+        "password": settings.wikijs_password
     }
 
 
 @pytest.fixture
 def searxng_test_url() -> str:
     """Test SearXNG URL."""
-    return "http://searxng:8080"
+    return f"http://{TEST_HOST}:8080"
 
 
 @pytest.fixture
 def ollama_test_config() -> dict:
     """Test Ollama configuration."""
+    from src.config import get_settings
+    settings = get_settings()
     return {
-        "base_url": "http://ollama:11434",
-        "model": "nomic-embed-text"
+        "base_url": f"http://{TEST_HOST}:11434",
+        "model": settings.ollama_embedding_model
     }
 
 
 @pytest.fixture
 def redis_test_url() -> str:
     """Test Redis URL."""
-    return "redis://redis-shared:6379/4"
+    return f"redis://{TEST_HOST}:6379/4"
 
 
 @pytest.fixture