Adapt experimental Server Cards imports to mcp-types package restructure

Upstream moved MCPModel into the new mcp-types workspace package and
turned mcp.types into a versioned package, so the old
`mcp.types._types.MCPModel` and `mcp.types.Icon` import paths no longer
resolve after rebasing onto main. Import Icon and MCPModel from mcp_types
instead.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: b7d5eea4-c5d2-4401-b7d8-93d0a9b6259a

Author: SamMorrowDrums

src/mcp/shared/experimental/ai_catalog/types.py

@@ -24,10 +24,9 @@
 from datetime import datetime
 from typing import Annotated, Any
 
+from mcp_types._types import MCPModel
 from pydantic import Field, model_validator
 
-from mcp.types._types import MCPModel
-
 #: Media type identifying an AI Catalog document.
 AI_CATALOG_MEDIA_TYPE = "application/ai-catalog+json"
 #: Media type identifying an MCP Server Card artifact in a catalog entry,

src/mcp/shared/experimental/server_card/types.py

@@ -17,11 +17,10 @@
 import re
 from typing import Annotated, Any, Literal
 
+from mcp_types import Icon
+from mcp_types._types import MCPModel
 from pydantic import Field, field_validator
 
-from mcp.types import Icon
-from mcp.types._types import MCPModel
-
 #: Canonical ``$schema`` value for a Server Card document.
 SERVER_CARD_SCHEMA_URL = "https://static.modelcontextprotocol.io/schemas/v1/server-card.schema.json"