Add lidarr-cleanup-singles package and integration

- Introduced a new package `lidarr-cleanup-singles` to identify and manage duplicate single tracks in Lidarr.
- Updated `flake.nix` to include the new package in outputs and modified app definitions to support it.
- Created a new script in `src-cleanup` for the main functionality, including audio fingerprint verification.
- Added necessary dependencies and configuration in `pyproject.toml` for the new package.
- Removed unused `flake-utils` and `systems` entries from `flake.lock` to streamline the configuration.

flake.nix

@@ -13,13 +13,17 @@
         inherit pkgs;
         src = lib.cleanSource ./src;
       };
+      lidarr-cleanup-singles = import ./nix/package-cleanup.nix {
+        inherit pkgs;
+        src = lib.cleanSource ./src-cleanup;
+      };
     in
     {
       nixosModules.lidarr-mb-gap = import ./nixos/lidarr-mb-gap.nix;
 
       packages.${system} = {
         default = lidarr-mb-gap;
-        inherit lidarr-mb-gap;
+        inherit lidarr-mb-gap lidarr-cleanup-singles;
       };
 
       apps.${system} = {
@@ -31,6 +35,10 @@
           type = "app";
           program = "${lidarr-mb-gap}/bin/lidarr-mb-gap";
         };
+        lidarr-cleanup-singles = {
+          type = "app";
+          program = "${lidarr-cleanup-singles}/bin/lidarr-cleanup-singles";
+        };
       };
 
       devShells.${system} = {
@@ -43,6 +51,7 @@
               ]
             ))
             pkgs.black
+            pkgs.chromaprint
           ];
           shellHook = ''
             echo "Python environment ready!"