fix(services/ollama): disable Ollama service by default

- Changed `enable` from `true` to `false` in default.nix configuration
- Ensures the service is not started automatically without user consent

Author: takeokunn

home-manager/services/ollama/default.nix

@@ -1,7 +1,7 @@
 { pkgs }:
 {
   services.ollama = {
-    enable = true;
+    enable = false;
     package = pkgs.ollama;
     host = "0.0.0.0";
   };