fix(colima): auto-restart launchd agent on boot-time failure

KeepAlive=false meant the single RunAtLoad attempt at login was the
only chance to start colima. If that attempt failed due to boot-time
races (VZ framework, stale lockfiles, virtiofs mount), launchd never
retried and required manual `colima start`.

Switch to SuccessfulExit=false so launchd retries on non-zero exit
while still respecting clean `colima stop`. Bump ThrottleInterval to
60s to give the system more headroom between retries.

Author: charliie-dev

modules/services/colima.nix

@@ -29,8 +29,10 @@ in
         DOCKER_CONFIG = "${config.xdg.configHome}/docker";
       };
       RunAtLoad = true;
-      KeepAlive = false;
-      ThrottleInterval = 30;
+      KeepAlive = {
+        SuccessfulExit = false;
+      };
+      ThrottleInterval = 60;
       StandardOutPath = "${logDir}/colima.log";
       StandardErrorPath = "${logDir}/colima.log";
     };