Fix: Add missing gaia.agents.tools package to setup.py (#283)

The `gaia.agents.tools` package directory exists with
`FileSearchToolsMixin` but was never registered in setup.py, causing
`ModuleNotFoundError` when importing.

Author: kovtcharov

setup.py

@@ -42,6 +42,7 @@
         "gaia.mcp.servers",
         "gaia.agents",
         "gaia.agents.base",
+        "gaia.agents.tools",
         "gaia.agents.blender",
         "gaia.agents.blender.core",
         "gaia.agents.chat",