deploy: rename swarm.enableRequiredServices to deploy.allSwarmServices

Both halves of the old name were wrong about the subject. The services
are required of the SWARM, not of the host, and the option says whether
THIS host runs them — so it described the wrong thing and sat in the
namespace that has to be identical on every host. The new name is mara's
own phrasing of what it means: "deploy all swarm level services on this
host".

mkRenamedOptionModule carries existing configs, read-side references
included, so this warns rather than failing to evaluate.

Three sites were not just the identifier:

- local-defaults.nix set it inside `config.services.hyperhive.swarm =
  { … }`. It moves out as a path beside the other deploy.* setter rather
  than into a second `deploy = { … }` attrset — the warning that file
  already carries about `swarm` applies to any second definition of the
  same parent.
- swarm-required-services.nix bound only `swarmCfg`, now unused; it binds
  and reads `deployCfg`.
- Two comments in that file described a half-migrated state, where the
  switch asserted some `swarm.*.enable` toggles and some `deploy.*` ones.
  Every one of them has been `deploy.*` for several slices now.

nix/host-modules/swarm.nix

@@ -80,7 +80,7 @@ let
   # ONE condition for all three of them, deliberately.
   #
   # 🩸 They were three independent conditions first, and that was wrong in
-  # a way only an eval gate finds: at the time `enableRequiredServices`
+  # a way only an eval gate finds: at the time `allSwarmServices`
   # turned on matrix and authelia but NOT nats, so an ordinary all-local
   # hive resolved authelia's two coordinates and not the queue URL. Two of
   # three set is exactly what the assertion below rejects, so every
@@ -382,7 +382,7 @@ in
     ];
   };
 
-  # `enableRequiredServices` is declared in ./swarm-required-services.nix
+  # `allSwarmServices` is declared in ./swarm-required-services.nix
   # together with the per-service `enable`s it asserts — it is a
   # deployment-shape switch rather than swarm bookkeeping, so it lives
   # with its consequences instead of here.