ci: add GitHub Actions workflows with semantic-release auto-versioning

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

src/controller/command.rs

@@ -87,7 +87,7 @@ pub fn parse_command(text: &str) -> Command {
                 mode: arg1.to_string(),
             }
         }
-        "/pipeline" => Command::Unknown(format!("/pipeline {} (use: full|quick|skip)", arg1)),
+        "/pipeline" => Command::Unknown(format!("/pipeline {arg1} (use: full|quick|skip)")),
         _ => Command::Unknown(cmd.to_string()),
     }
 }