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

Author: dsp-ant

examples/fastmcp/complex_inputs.py

@@ -0,0 +1,28 @@
+"""
+FastMCP Complex inputs Example
+
+Demonstrates validation via pydantic with complex models.
+"""
+
+from pydantic import BaseModel, Field
+from typing import Annotated
+from mcp.server.fastmcp import FastMCP
+
+mcp = FastMCP("Shrimp Tank")
+
+
+class ShrimpTank(BaseModel):
+    class Shrimp(BaseModel):
+        name: Annotated[str, Field(max_length=10)]
+
+    shrimp: list[Shrimp]
+
+
+@mcp.tool()
+def name_shrimp(
+    tank: ShrimpTank,
+    # You can use pydantic Field in function signatures for validation.
+    extra_names: Annotated[list[str], Field(max_length=10)],
+) -> list[str]:
+    """List all shrimp names in the tank"""
+    return [shrimp.name for shrimp in tank.shrimp] + extra_names

examples/fastmcp/desktop.py

@@ -0,0 +1,25 @@
+"""
+FastMCP Desktop Example
+
+A simple example that exposes the desktop directory as a resource.
+"""
+
+from pathlib import Path
+
+from mcp.server.fastmcp import FastMCP
+
+# Create server
+mcp = FastMCP("Demo")
+
+
+@mcp.resource("dir://desktop")
+def desktop() -> list[str]:
+    """List the files in the user's desktop"""
+    desktop = Path.home() / "Desktop"
+    return [str(f) for f in desktop.iterdir()]
+
+
+@mcp.tool()
+def add(a: int, b: int) -> int:
+    """Add two numbers"""
+    return a + b

examples/fastmcp/echo.py

@@ -0,0 +1,30 @@
+"""
+FastMCP Echo Server
+"""
+
+from mcp.server.fastmcp import FastMCP
+
+# Create server
+mcp = FastMCP("Echo Server")
+
+
+@mcp.tool()
+def echo_tool(text: str) -> str:
+    """Echo the input text"""
+    return text
+
+
+@mcp.resource("echo://static")
+def echo_resource() -> str:
+    return "Echo!"
+
+
+@mcp.resource("echo://{text}")
+def echo_template(text: str) -> str:
+    """Echo the input text"""
+    return f"Echo: {text}"
+
+
+@mcp.prompt("echo")
+def echo_prompt(text: str) -> str:
+    return text