fix: correct 2023-03-21 client wire contracts across the API and notify surfaces

Audits every route the March-2023 client can call against what this server
actually serves, and fixes the defects that were breaking gameplay. Adds
docs/recroom-2023-client-api-complete.md as the reference: ~500 route
literals across 13 subsystems, with verb, request/response shape, and a
per-subsystem diff. 315 defects catalogued; the ones fixed here are listed
in its "Already fixed" table.

Path coverage was never the problem — 465 of 506 routes already had
handlers. The failures were in shape, and they cluster into four causes:

- Wrong verb. The verb is a BestHTTP.HTTPMethods ordinal (GET=0 .. PATCH=5),
  confirmed from that enum's static constructor. Routes registered POST-only
  while the client PUTs returned 405, which made room consumables neither
  buyable nor consumable and blocked every room-key edit.
- Bare scalar wrapped in an object. The client reads `1000`, not
  `{"Limit":1000}`; the issuing method signature says which. Wrapping makes
  the deserializer throw and the feature dies silently.
- [FromBody] vs form-urlencoded. The client sends nearly every write as form
  data, which an [ApiController] action bound [FromBody] rejects with 415
  before the handler runs. This alone broke all 13 club member-management
  endpoints. Adds Binding/FormOrJsonModelBinder so this is fixed once.
- Notify dispatch keys. Both enum overloads of the client's RegisterHandler
  lower the id via Int32.ToString() and register only that numeric key, and
  lookup is a case-sensitive TryGetValue that returns silently on a miss. We
  were sending the enum NAME for most ids, so friend-request updates, forced
  logout, maintenance broadcasts, live balance and consumable updates, and
  invention moderation pushes all evaporated with no error anywhere.

Notable behavioural bugs fixed:

- Editing a club announcement deleted it: PUT was a third binding on the
  delete handler. Split apart, and the missing create route added.
- leaderboard/CheckAndSetStat did not exist. The 2023 client has no SetStat
  literal at all, so every leaderboard score it wrote was discarded.
- Setting a club clubhouse cleared it: the handler read roomId from the query
  while the client sends it in the body, then wrote the resulting null.
- Club join requests were inverted (the enum is Open=0, InviteOnly=1,
  AskToJoin=2), so ask-to-join clubs rejected everyone and invite-only clubs
  quietly admitted them.
- Room bans were pushed as id 24, for which the client registers no handler;
  they now go out as ModerationKick with IsBan, so the ban takes effect
  immediately instead of at next login.
- Room-key ownership queries answered for the wrong player, and "has anyone
  bought this key" asked "did I buy it" — always false for the creator.

Also persists settings that were previously acknowledged and dropped
(playlist accessibility/restrictions/level-voting/warning, per-player status
visibility, VR movement mode and avoid-juniors, custom room codes), which is
what the new columns in the migration are for.

One test asserted the old nested PriceAndCurrency response shape; the
client's consumable formatter has no such key and reads Price and
PurchaseCurrencyId flat, so the test was corrected alongside the handler.

DorkNet.Server/Services/ClubService.cs

@@ -522,6 +522,50 @@ public class ClubService(DorkNetDbContext db)
     public Task<ClubAnnouncementEntity?> AnnouncementAsync(long clubId, long announcementId) =>
         db.ClubAnnouncements.FirstOrDefaultAsync(a => a.Id == announcementId && a.ClubId == clubId);
 
+    /// <summary>Create a club announcement. Returns the new row's id, or null
+    /// when the caller may not manage the club.</summary>
+    public async Task<long?> CreateAnnouncementAsync(
+        long clubId, long callerId, string title, string body, string imageName)
+    {
+        if (!await CanManageAsync(clubId, callerId)) return null;
+        var row = new ClubAnnouncementEntity
+        {
+            ClubId = clubId,
+            AuthorPlayerId = callerId,
+            Title = Truncate(title, 200),
+            Body = Truncate(body, 4000),
+            ImageName = Truncate(imageName, 256),
+        };
+        db.ClubAnnouncements.Add(row);
+        await db.SaveChangesAsync();
+        return row.Id;
+    }
+
+    /// <summary>Edit an existing announcement in place. Null arguments leave
+    /// the corresponding field untouched. Returns false when the caller may
+    /// not manage the club or the row is unknown.</summary>
+    public async Task<bool> UpdateAnnouncementAsync(
+        long clubId, long announcementId, long callerId,
+        string? title, string? body, string? imageName)
+    {
+        if (!await CanManageAsync(clubId, callerId)) return false;
+        var row = await db.ClubAnnouncements
+            .FirstOrDefaultAsync(a => a.Id == announcementId && a.ClubId == clubId);
+        if (row is null) return false;
+        if (title is not null) row.Title = Truncate(title, 200);
+        if (body is not null) row.Body = Truncate(body, 4000);
+        if (imageName is not null) row.ImageName = Truncate(imageName, 256);
+        row.UpdatedAt = DateTime.UtcNow;
+        await db.SaveChangesAsync();
+        return true;
+    }
+
+    private static string Truncate(string? value, int max)
+    {
+        value = (value ?? string.Empty).Trim();
+        return value.Length <= max ? value : value[..max];
+    }
+
     /// <summary>Delete an announcement after verifying the caller can
     /// manage the club. Idempotent: missing row → no-op.</summary>
     public async Task<bool> DeleteAnnouncementAsync(long clubId, long announcementId, long callerId)