Fix compilation errors

- Fix f32 comparison: use partial_cmp instead of cmp
- Add Datelike import for ordinal() method
- Remove unused imports (Arc, Mutex)
- Fix unused variable warning (user_type -> _user_type)

All errors and most warnings are now resolved.

src/mcp/base.rs

@@ -5,7 +5,6 @@ use std::io::{self, BufRead, Write};
 use crate::memory::MemoryManager;
 use crate::game_formatter::{GameFormatter, DiagnosisType};
 use crate::companion::{Companion, CompanionPersonality, CompanionFormatter};
-use std::sync::{Arc, Mutex};
 
 pub struct BaseMCPServer {
     pub memory_manager: MemoryManager,