chore: fix all 702 clippy warnings across codebase - auto-fix 475 via cargo clippy --fix - fix remaining 227 manually: uninlined_format_args, redundant_closure, match_same_arms, underscore_binding, format_push_string, items_after_statements, needless_pass_by_value, clone_on_copy, case_sensitive_extension, single_match/let-else, write_with_newline, and other clippy lints