fix(tool-runtime): Remove authorization from list_runtime_tools()

The authorization parameter should only be on invoke_tool(), not on
list_runtime_tools(). Tool listing typically doesn't require authentication,
and the client SDK doesn't have this parameter yet.

Changes:
1. Removed authorization parameter from ToolRuntime.list_runtime_tools() protocol method
2. Updated all implementations to remove the authorization parameter:
   - MCPProviderImpl.list_runtime_tools()
   - ToolRuntimeRouter.list_runtime_tools()
   - ToolGroupsRoutingTable.list_tools() and _index_tools()
3. Updated test to remove authorization from list_tools() call

This ensures compatibility with the llama-stack-client SDK which doesn't
support authorization on list_tools() yet. Only invoke_tool() requires
and accepts the authorization parameter for authenticated tool execution.

tests/integration/inference/test_tools_with_schemas.py

@@ -196,7 +196,6 @@ class TestMCPToolsInChatCompletion:
         # Get the tools from MCP
         tools_response = llama_stack_client.tool_runtime.list_tools(
             tool_group_id=test_toolgroup_id,
-            authorization=AUTH_TOKEN,
         )
 
         # Convert to OpenAI format for inference