Migrate to NixOS 24.05 stable branch

- Update flake.nix to use nixos-24.05 and home-manager release-24.05
- Remove deprecated services.pulseaudio configurations
- Fix home-manager compatibility issues:
  - Update stateVersion from 24.11 to 24.05
  - Change VSCode profiles.default.extensions to extensions
  - Update ZSH initContent to initExtra
  - Remove incompatible git signing.format option
- Remove unavailable windsurf package from dev.nix
- Successfully tested with nixos-rebuild dry-run

flake.lock

@@ -7,15 +7,16 @@
         ]
       },
       "locked": {
-        "lastModified": 1753829416,
-        "narHash": "sha256-Shx91k6pLdX8wK6LchsHRXWAWODvy6fHAbUqOmye43A=",
+        "lastModified": 1726989464,
+        "narHash": "sha256-Vl+WVTJwutXkimwGprnEtXc/s/s8sMuXzqXaspIGlwM=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "ab14805267c132c5e9ac66129ca5361abd592a3a",
+        "rev": "2f23fa308a7c067e52dfcc30a0758f47043ec176",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
+        "ref": "release-24.05",
         "repo": "home-manager",
         "type": "github"
       }
@@ -38,16 +39,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1753694789,
-        "narHash": "sha256-cKgvtz6fKuK1Xr5LQW/zOUiAC0oSQoA9nOISB0pJZqM=",
+        "lastModified": 1735563628,
+        "narHash": "sha256-OnSAY7XDSx7CtDoqNh8jwVwh4xNL/2HaJxGjryLWzX8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "dc9637876d0dcc8c9e5e22986b857632effeb727",
+        "rev": "b134951a4c9f3c995fd7be05f3243f8ecd65d798",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
-        "ref": "nixos-unstable",
+        "ref": "nixos-24.05",
         "type": "indirect"
       }
     },