chore(backend): rename openfootmanager_lib crate to olmanager_lib

[NicoRuedaA]

Summary

• Renames the Rust backend crate from openfootmanager_lib to olmanager_lib
• Updates all 3 references: Cargo.toml, main.rs, and lib.rs
• cargo check passes
• Zero remaining references to the old name

Why

Part of the football to LoL migration effort. The crate name still references the old openfootmanager identity which is no longer accurate for a League of Legends manager game.

Scope

File	Change
src-tauri/Cargo.toml	name = "openfootmanager_lib" to name = "olmanager_lib"
src-tauri/src/main.rs	openfootmanager_lib::run() to olmanager_lib::run()
src-tauri/src/lib.rs	Log level filter updated

Checklist

• cargo check passes
• No remaining references to old crate name
• Pre-existing test failures in lol_sim_v2 are out of scope (14 errors exist on main before this change)

Closes #61

[NicoRuedaA]

Original issue: #61