refactor: Update FastMCP examples to use new import path

Update all FastMCP examples to use mcp.server.fastmcp instead of fastmcp.
Add tests to verify example servers work correctly.

Changes:
- Update import paths in all example files
- Create test_examples.py to verify functionality
- Fix test assertions to match actual response format

examples/fastmcp/text_me.py

@@ -0,0 +1,71 @@
+# /// script
+# dependencies = ["fastmcp"]
+# ///
+
+"""
+FastMCP Text Me Server
+--------------------------------
+This defines a simple FastMCP server that sends a text message to a phone number via https://surgemsg.com/.
+
+To run this example, create a `.env` file with the following values:
+
+SURGE_API_KEY=...
+SURGE_ACCOUNT_ID=...
+SURGE_MY_PHONE_NUMBER=...
+SURGE_MY_FIRST_NAME=...
+SURGE_MY_LAST_NAME=...
+
+Visit https://surgemsg.com/ and click "Get Started" to obtain these values.
+"""
+
+from typing import Annotated
+import httpx
+from pydantic import BeforeValidator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+from mcp.server.fastmcp import FastMCP
+
+
+class SurgeSettings(BaseSettings):
+    model_config: SettingsConfigDict = SettingsConfigDict(
+        env_prefix="SURGE_", env_file=".env"
+    )
+
+    api_key: str
+    account_id: str
+    my_phone_number: Annotated[
+        str, BeforeValidator(lambda v: "+" + v if not v.startswith("+") else v)
+    ]
+    my_first_name: str
+    my_last_name: str
+
+
+# Create server
+mcp = FastMCP("Text me")
+surge_settings = SurgeSettings()  # type: ignore
+
+
+@mcp.tool(name="textme", description="Send a text message to me")
+def text_me(text_content: str) -> str:
+    """Send a text message to a phone number via https://surgemsg.com/"""
+    with httpx.Client() as client:
+        response = client.post(
+            "https://api.surgemsg.com/messages",
+            headers={
+                "Authorization": f"Bearer {surge_settings.api_key}",
+                "Surge-Account": surge_settings.account_id,
+                "Content-Type": "application/json",
+            },
+            json={
+                "body": text_content,
+                "conversation": {
+                    "contact": {
+                        "first_name": surge_settings.my_first_name,
+                        "last_name": surge_settings.my_last_name,
+                        "phone_number": surge_settings.my_phone_number,
+                    }
+                },
+            },
+        )
+        response.raise_for_status()
+        return f"Message sent: {text_content}"