refactor: remove deployment.json and use direct selectors

- Remove deployment.json file generation from outputs.nix
- Add throw for deprecated deployment.file usage with upgrade instructions
- Remove vars data from deployment.data
- Update Machine class to use direct select() calls instead of deployment property
- Update all deployment property accesses to use direct selectors
- Add precaching for frequently accessed values in update.py:
  - Module paths for facts and vars
  - Deployment settings (requireExplicitUpdate, nixosMobileWorkaround)
  - Services and generators data
  - Secret upload locations
- This removes unnecessary JSON serialization and makes the code more composable

pkgs/clan-cli/clan_cli/facts/secret_modules/sops.py

@@ -31,7 +31,7 @@ class SecretStore(SecretStoreBase):
             sops_secrets_folder(self.machine.flake_dir)
             / f"{self.machine.name}-age.key",
             priv_key,
-            add_groups=self.machine.deployment["sops"]["defaultGroups"],
+            add_groups=self.machine.select("config.clan.core.sops.defaultGroups"),
             age_plugins=load_age_plugins(self.machine.flake),
         )
         add_machine(self.machine.flake_dir, self.machine.name, pub_key, False)