Revert "[feat] introduce Config for centralized runtime settings; refactor progress management and backend selection to leverage config"

This reverts commit 9120e8fb26.

src/progress.rs

@@ -107,13 +107,6 @@ impl ProgressFactory {
             _ => ProgressManager::noop(),
         }
     }
-
-    /// Preferred constructor using Config. Respects config.no_progress and TTY.
-    pub fn from_config(config: &crate::Config) -> Self {
-        // Prefer Config.no_progress over manual flag; still honor NO_PROGRESS env var.
-        let force_disable = config.no_progress;
-        Self::new(force_disable)
-    }
 }
 
 #[derive(Clone)]