Add pt-BR docs translation (#3039)

* docs: add pt-br translations

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* Update mcp/overview.mdx brazilian docs

Its en-US counterpart was updated after I did a pass,
so now it includes the new section about @CrewBase

docs/en/mcp/stdio.mdx

@@ -0,0 +1,134 @@
+---
+title: Stdio Transport
+description: Learn how to connect CrewAI to local MCP servers using the Stdio (Standard Input/Output) transport mechanism.
+icon: server
+---
+
+## Overview
+
+The Stdio (Standard Input/Output) transport is designed for connecting `MCPServerAdapter` to local MCP servers that communicate over their standard input and output streams. This is typically used when the MCP server is a script or executable running on the same machine as your CrewAI application.
+
+## Key Concepts
+
+- **Local Execution**: Stdio transport manages a locally running process for the MCP server.
+- **`StdioServerParameters`**: This class from the `mcp` library is used to configure the command, arguments, and environment variables for launching the Stdio server.
+
+## Connecting via Stdio
+
+You can connect to an Stdio-based MCP server using two main approaches for managing the connection lifecycle:
+
+### 1. Fully Managed Connection (Recommended)
+
+Using a Python context manager (`with` statement) is the recommended approach. It automatically handles starting the MCP server process and stopping it when the context is exited.
+
+```python
+from crewai import Agent, Task, Crew, Process
+from crewai_tools import MCPServerAdapter
+from mcp import StdioServerParameters
+import os
+
+# Create a StdioServerParameters object
+server_params=StdioServerParameters(
+    command="python3", 
+    args=["servers/your_stdio_server.py"],
+    env={"UV_PYTHON": "3.12", **os.environ},
+)
+
+with MCPServerAdapter(server_params) as tools:
+    print(f"Available tools from Stdio MCP server: {[tool.name for tool in tools]}")
+
+    # Example: Using the tools from the Stdio MCP server in a CrewAI Agent
+    research_agent = Agent(
+        role="Local Data Processor",
+        goal="Process data using a local Stdio-based tool.",
+        backstory="An AI that leverages local scripts via MCP for specialized tasks.",
+        tools=tools,
+        reasoning=True,
+        verbose=True,
+    )
+    
+    processing_task = Task(
+        description="Process the input data file 'data.txt' and summarize its contents.",
+        expected_output="A summary of the processed data.",
+        agent=research_agent,
+        markdown=True
+    )
+    
+    data_crew = Crew(
+        agents=[research_agent],
+        tasks=[processing_task],
+        verbose=True,
+        process=Process.sequential 
+    )
+   
+    result = data_crew.kickoff()
+    print("\nCrew Task Result (Stdio - Managed):\n", result)
+
+```
+
+### 2. Manual Connection Lifecycle
+
+If you need finer-grained control over when the Stdio MCP server process is started and stopped, you can manage the `MCPServerAdapter` lifecycle manually.
+
+<Info>
+You **MUST** call `mcp_server_adapter.stop()` to ensure the server process is terminated and resources are released. Using a `try...finally` block is highly recommended.
+</Info>
+
+```python
+from crewai import Agent, Task, Crew, Process
+from crewai_tools import MCPServerAdapter
+from mcp import StdioServerParameters
+import os
+
+# Create a StdioServerParameters object
+stdio_params=StdioServerParameters(
+    command="python3", 
+    args=["servers/your_stdio_server.py"],
+    env={"UV_PYTHON": "3.12", **os.environ},
+)
+
+mcp_server_adapter = MCPServerAdapter(server_params=stdio_params)
+try:
+    mcp_server_adapter.start()  # Manually start the connection and server process
+    tools = mcp_server_adapter.tools
+    print(f"Available tools (manual Stdio): {[tool.name for tool in tools]}")
+
+    # Example: Using the tools with your Agent, Task, Crew setup
+    manual_agent = Agent(
+        role="Local Task Executor",
+        goal="Execute a specific local task using a manually managed Stdio tool.",
+        backstory="An AI proficient in controlling local processes via MCP.",
+        tools=tools,
+        verbose=True
+    )
+    
+    manual_task = Task(
+        description="Execute the 'perform_analysis' command via the Stdio tool.",
+        expected_output="Results of the analysis.",
+        agent=manual_agent
+    )
+    
+    manual_crew = Crew(
+        agents=[manual_agent],
+        tasks=[manual_task],
+        verbose=True,
+        process=Process.sequential
+    )
+        
+       
+    result = manual_crew.kickoff() # Actual inputs depend on your tool
+    print("\nCrew Task Result (Stdio - Manual):\n", result)
+            
+except Exception as e:
+    print(f"An error occurred during manual Stdio MCP integration: {e}")
+finally:
+    if mcp_server_adapter and mcp_server_adapter.is_connected: # Check if connected before stopping
+        print("Stopping Stdio MCP server connection (manual)...")
+        mcp_server_adapter.stop()  # **Crucial: Ensure stop is called**
+    elif mcp_server_adapter: # If adapter exists but not connected (e.g. start failed)
+        print("Stdio MCP server adapter was not connected. No stop needed or start failed.")
+
+```
+
+Remember to replace placeholder paths and commands with your actual Stdio server details. The `env` parameter in `StdioServerParameters` can 
+be used to set environment variables for the server process, which can be useful for configuring its behavior or providing necessary paths (like `PYTHONPATH`).