fix(relays): the generic HTTP board never sent its URLs; cluster filters start off

buildDeviceDriver had no case for "httpgen", so the generic board fell through
to the WebSwitch driver: it polled an address it had never been given, reported
itself offline, greyed out every relay button, and sent none of the configured
URLs. Nothing in the interface said so — the board was configured, saved and
listed, and simply did nothing. deviceKey did not cover the URLs either, so once
that is fixed, correcting a typo in one would still have handed back the cached
driver holding the old address until a restart.

Two shapes of home-made switch could not be described at all:

  - a bit-mask board whose four URLs differ by one character
    (/Set0/1, /Set0/2, /Set0/4, /Set0/8) — {value} in the pattern now takes the
    number from the per-relay box, keeping the address in one place;
  - a board numbering its channels from zero — {relay-1}, since giving up the
    pattern for eight hand-typed URLs was the only alternative.

The pattern decides what the per-relay boxes hold, and the grid says which as
soon as {value} is typed: guessing per box ("does this look like a URL?") would
change meaning on a typo, which is not a thing to do to something wired to an
antenna. A URL typed without a scheme gets http:// like the named boards get
from relayBase; https:// is passed through untouched.

Host and the connection test are gone for this type. It has no address of its
own — its relays may each live on a different box — and no status to read, so a
test could only ever answer "OK, 4 relays". Save was greyed out without a host,
which made a complete configuration of four full URLs impossible to store.

Cluster filters no longer persist across launches. A band lock set weeks earlier
is invisible to whoever set it: the counter reads 76 spots live, the grid is
empty, and the search goes to the cluster instead. Nobody loses work by
re-ticking a chip. Grouping and the panel state still persist — they change how
spots look, never whether they appear.

changelog.json

@@ -5,12 +5,16 @@
     "en": [
       "WinKeyer: the opening probe goes out as one write, matching a capture of a client that talks to the same K3NG keyer, and the handshake bytes are always logged so a keyer that stays silent can be diagnosed.",
       "DX cluster: when spots arrive and every one is filtered out, the panel says so, names the filters doing it and offers to clear them — it used to say “waiting for spots” beside a counter reading 76 live.",
-      "DX cluster: the log times the connection and the first spot, so a slow first launch can be told apart from a quiet node."
+      "DX cluster: the log times the connection and the first spot, so a slow first launch can be told apart from a quiet node.",
+      "DX cluster: filters now start off at every launch — a band lock left on from a previous session hid every spot.",
+      "Generic HTTP relay: its URLs were never actually sent — fixed. Adds {value} and {relay-1}, https, and no host or test needed."
     ],
     "fr": [
       "WinKeyer : la sonde d’ouverture part en un seul envoi, calquée sur la capture d’un client qui dialogue avec le même manipulateur K3NG, et les octets de la poignée de main sont toujours journalisés pour diagnostiquer un manipulateur muet.",
       "Cluster DX : quand des spots arrivent et que tout est filtré, le panneau le dit, nomme les filtres responsables et propose de les effacer — il affichait « en attente de spots » à côté d’un compteur à 76 en direct.",
-      "Cluster DX : le journal chronomètre la connexion et le premier spot, pour distinguer un premier lancement lent d’un nœud silencieux."
+      "Cluster DX : le journal chronomètre la connexion et le premier spot, pour distinguer un premier lancement lent d’un nœud silencieux.",
+      "Cluster DX : les filtres démarrent désactivés à chaque lancement — un verrou de bande oublié masquait tous les spots.",
+      "Relais HTTP générique : ses URL n’étaient jamais envoyées — corrigé. Ajoute {value} et {relay-1}, https, sans hôte ni test."
     ]
   },
   {