py(deps[mcp]): Pin fastmcp to >=3.1.0,<4.0.0

why: The previous pin `>=2.3.0` was too loose — FastMCP 3.x has a
different API from 2.x (e.g. `title=` kwarg on `mcp.tool()`,
`version=` on constructor). A future 4.x release could also break.
The server uses 3.x features added in 3.1.0.
what:
- Pin fastmcp to `>=3.1.0,<4.0.0`
- Update uv.lock

Author: tony

pyproject.toml

@@ -114,7 +114,7 @@ lint = [
 
 [project.optional-dependencies]
 mcp = [
-    "fastmcp>=2.3.0; python_version >= '3.10'",
+    "fastmcp>=3.1.0,<4.0.0; python_version >= '3.10'",
 ]
 
 [project.scripts]