refactor(common): move package search into shared base

- Install nix-search-cli through common.nix
- Remove its development module entry and update documentation

README.md

@@ -103,7 +103,7 @@ language runtimes or Kubernetes/Terraform tooling. Android
 Studio remains on the ThinkPads as an existing IDE/workflow choice, but its
 bundled SDK is worth reviewing if moving fully to project-local tooling.
 
-For fast package discovery, the shared tools include `nix-search-cli`:
+For fast package discovery, `common.nix` installs `nix-search-cli` on every host:
 
 ```sh
 nix-search --channel=26.05 blender

modules/common.nix

@@ -12,6 +12,8 @@
   };
   nixpkgs.config.allowUnfree = true;
 
+  environment.systemPackages = [ pkgs.nix-search-cli ];
+
   networking.networkmanager.enable = true;
   time.timeZone = "Africa/Tunis";
   i18n.defaultLocale = "en_US.UTF-8";

modules/development.nix

@@ -10,7 +10,6 @@
     tmux
     ripgrep
     fd
-    nix-search-cli
     duf
     dust
     killall