fix: update google-adk version >=1.18

Author: zakahan

pyproject.toml

@@ -15,7 +15,7 @@ dependencies = [
     "pydantic-settings>=2.10.1", # Config management
     "a2a-sdk>=0.3.0", # For Google Agent2Agent protocol
     "deprecated>=1.2.18",
-    "google-adk>=1.10.0", # For basic agent architecture
+    "google-adk>=1.18.0", # For basic agent architecture
     "litellm>=1.79.3", # For model inference
     "loguru>=0.7.3", # For better logging
     "opentelemetry-exporter-otlp>=1.35.0",