Simplify `src/mcp/shared/metadata_utils.py::get_display_name` logic.

阅读 src/mcp/shared/metadata_utils.py::get_display_name，并将其当前优先级与拟议的调整进行比较。当对每个列出的对象都首先检查 title、Tool annotations.title 仍作为中间 fallback、obj.name 仍作为最终 fallback 时，工作即完成。

Current Code Logic

As of now, src/mcp/shared/metadata_utils.py::get_display_name works like this:

def get_display_name(obj: Tool | Resource | Prompt | ResourceTemplate | Implementation) -> str:
    """Get the display name for an MCP object with proper precedence.

    This is a client-side utility function designed to help MCP clients display
    human-readable names in their user interfaces. When servers provide a 'title'
    field, it should be preferred over the programmatic 'name' field for display.

    For tools: title > annotations.title > name
    For other objects: title > name

    Example:
        ```python
        # In a client displaying available tools
        tools = await session.list_tools()
        for tool in tools.tools:
            display_name = get_display_name(tool)
            print(f"Available tool: {display_name}")
        ```

    Args:
        obj: An MCP object with name and optional title fields

    Returns:
        The display name to use for UI presentation
    """
    if isinstance(obj, Tool):
        # Tools have special precedence: title > annotations.title > name
        if hasattr(obj, "title") and obj.title is not None:
            return obj.title
        if obj.annotations and hasattr(obj.annotations, "title") and obj.annotations.title is not None:
            return obj.annotations.title
        return obj.name
    else:
        # All other objects: title > name
        if hasattr(obj, "title") and obj.title is not None:
            return obj.title
        return obj.name

However, code logic here can simplify, since title-first precedence applies to every object type.

Only Tool-specific not None annotations.title fallback needs a special middle branch.

Proposed Logical Adjustments

# All objects have title-first precedence, regardless of being a Tool or not.
if hasattr(obj, "title") and obj.title is not None:
    return obj.title

# Special middle branch for Tool-specific not None `annotations.title`.
if isinstance(obj, Tool) and obj.annotations:
    if hasattr(obj.annotations, "title") and obj.annotations.title is not None:
        return obj.annotations.title

# All other objects: name as last fallback.
return obj.name