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

tests/test_examples.py

@@ -0,0 +1,50 @@
+"""Tests for example servers"""
+import pytest
+from mcp.shared.memory import create_connected_server_and_client_session as client_session
+
+@pytest.mark.anyio
+async def test_simple_echo():
+    """Test the simple echo server"""
+    from examples.fastmcp.simple_echo import mcp
+    
+    async with client_session(mcp._mcp_server) as client:
+        result = await client.call_tool("echo", {"text": "hello"})
+        assert len(result.content) == 1
+        content = result.content[0]
+        assert content.text == "hello"
+
+@pytest.mark.anyio
+async def test_complex_inputs():
+    """Test the complex inputs server"""
+    from examples.fastmcp.complex_inputs import mcp
+    
+    async with client_session(mcp._mcp_server) as client:
+        tank = {
+            "shrimp": [{"name": "bob"}, {"name": "alice"}]
+        }
+        result = await client.call_tool("name_shrimp", {
+            "tank": tank,
+            "extra_names": ["charlie"]
+        })
+        assert len(result.content) == 3
+        assert result.content[0].text == "bob"
+        assert result.content[1].text == "alice"
+        assert result.content[2].text == "charlie"
+
+@pytest.mark.anyio
+async def test_desktop():
+    """Test the desktop server"""
+    from examples.fastmcp.desktop import mcp
+    
+    async with client_session(mcp._mcp_server) as client:
+        # Test the add function
+        result = await client.call_tool("add", {"a": 1, "b": 2})
+        assert len(result.content) == 1
+        content = result.content[0]
+        assert content.text == "3"
+        
+        # Test the desktop resource
+        result = await client.read_resource("dir://desktop")
+        assert len(result.contents) == 1
+        content = result.contents[0]
+        assert isinstance(content.text, str)