Remove automatic cache scan on startup

- Cache is now only refreshed when user presses 'r'
- Empty cache on first launch - user must manually scan
- More explicit control over library updates

src/main.rs

@@ -31,20 +31,12 @@ async fn main() -> Result<()> {
 
     tracing::info!("Loaded config from {:?}", config_path);
 
-    // Load cache
-    let mut cache = cache::Cache::load(&cache_dir)
+    // Load cache (empty if doesn't exist - user must press 'r' to scan)
+    let cache = cache::Cache::load(&cache_dir)
         .context("Failed to load cache")?;
 
     tracing::info!("Loaded cache from {:?}", cache_dir);
 
-    // If cache is empty and we have scan paths, perform initial scan
-    if cache.file_tree.is_empty() && !config.scan_paths.paths.is_empty() {
-        tracing::info!("Cache is empty, performing initial scan...");
-        cache = scanner::scan_paths(&config.scan_paths.paths)?;
-        cache.save(&cache_dir)?;
-        tracing::info!("Initial scan complete, cache saved");
-    }
-
     // Initialize player
     let mut player = player::Player::new()?;