refactor:

- changed method get_agent_tools for only get_tools on agent interface
- changed OllamaModelManager to correc semantic OllamaService

test:
- added test for service initialization
- added tests to list tools and create tools into  PDF agent

.vscode/settings.json

@@ -2,7 +2,8 @@
     "python.testing.pytestEnabled": false,
     "python.testing.unittestEnabled": true,
     "python.analysis.extraPaths": [
-        "./src/service"
+        "./src/service",
+        "./"
     ],
 
     "python.testing.unittestArgs": [