Remove the examples' pydantic-settings usage instead of carrying the dependency

pydantic-settings was left in the dev group only because two examples used it.
The text_me example needs a paid third-party SMS account to run and nothing
references or tests it, so delete it. The simple-auth example's two settings
classes are always constructed with explicit values or defaults, so plain
pydantic models do the same job; drop pydantic-settings from that example's
dependencies and from the root dev group.

Author: maxisbey

examples/mcpserver/text_me.py

@@ -12,8 +12,7 @@
 from typing import Any, Literal
 
 import click
-from pydantic import AnyHttpUrl
-from pydantic_settings import BaseSettings, SettingsConfigDict
+from pydantic import AnyHttpUrl, BaseModel
 
 from mcp.server.auth.settings import AuthSettings
 from mcp.server.mcpserver.server import MCPServer
@@ -23,11 +22,9 @@
 logger = logging.getLogger(__name__)
 
 
-class ResourceServerSettings(BaseSettings):
+class ResourceServerSettings(BaseModel):
     """Settings for the MCP Resource Server."""
 
-    model_config = SettingsConfigDict(env_prefix="MCP_RESOURCE_")
-
     # Server settings
     host: str = "localhost"
     port: int = 8001

examples/servers/simple-auth/mcp_simple_auth/server.py

@@ -12,8 +12,7 @@
 import time
 from typing import Any
 
-from pydantic import AnyHttpUrl
-from pydantic_settings import BaseSettings, SettingsConfigDict
+from pydantic import AnyHttpUrl, BaseModel
 from starlette.exceptions import HTTPException
 from starlette.requests import Request
 from starlette.responses import HTMLResponse, RedirectResponse, Response
@@ -29,11 +28,9 @@
 from mcp.shared.auth import OAuthClientInformationFull, OAuthToken
 
 
-class SimpleAuthSettings(BaseSettings):
+class SimpleAuthSettings(BaseModel):
     """Simple OAuth settings for demo purposes."""
 
-    model_config = SettingsConfigDict(env_prefix="MCP_")
-
     # Demo user credentials
     demo_username: str = "demo_user"
     demo_password: str = "demo_password"

examples/servers/simple-auth/mcp_simple_auth/simple_auth_provider.py

@@ -12,7 +12,6 @@ dependencies = [
     "httpx2>=2.5.0",
     "mcp",
     "pydantic>=2.0",
-    "pydantic-settings>=2.5.2",
     "sse-starlette>=1.6.1",
     "uvicorn>=0.23.1; sys_platform != 'emscripten'",
 ]

examples/servers/simple-auth/pyproject.toml

@@ -58,9 +58,6 @@ dev = [
     # We add mcp[cli] so `uv sync` considers the extras.
     "mcp[cli]",
     "mcp-example-stories",
-    # pydantic-settings is used only by examples (simple-auth, mcpserver/text_me);
-    # keep it reachable for pyright, which covers examples/servers.
-    "pydantic-settings>=2.5.2",
     "tomli>=2.0; python_version < '3.11'",
     "pyright>=1.1.400",
     "pytest>=8.4.0",