Normalize Nix module formatting and update flake.lock

Consistently format module argument blocks and convert aligned
package comments to inline comments. Trim trailing whitespace and
minor layout tweaks across modules. Bump opencode rev, narHash and
lastModified in flake.lock and remove the original dev ref.

modules/navidrome.nix

@@ -1,6 +1,11 @@
 # modules/navidrome.nix
 # Self-hosted music streaming server
-{ config, pkgs, lib, ... }:
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
 
 {
   # ═══════════════════════════════════════════════════════════════
@@ -24,8 +29,8 @@
       EnableTranscodingConfig = true;
 
       # Scan settings
-      ScanSchedule = "@every 1h";    # Rescan library every hour
-      
+      ScanSchedule = "@every 1h"; # Rescan library every hour
+
       # Last.fm scrobbling (configure in UI after setup)
       LastFM.Enabled = true;