fix(contracts): auto-credit kill objectives in client-hosted raids

Kill-type contract objectives were never persisted: the client-hosted
raid has no dedicated game server to report per-kill progress, so
creature kills stayed at 0 and contracts reported "no kills" at claim.

- EnterMatchmakingMatch: auto-credit Kills objectives to MaxProgress on
  deploy (mirrors the item-ownership pre-compute already done there and
  the player-kill auto-credit in ActivateContract).
- ClaimActiveContract: treat Kills objectives as met as a safety net for
  contracts activated before deploy.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Prospect.Server.Api/Services/CloudScript/Functions/EnterMatchmakingMatch.cs

@@ -61,6 +61,14 @@ public class EnterMatchmakingMatchFunction : ICloudScriptFunction<FYEnterMatchAz
             }
             for (var i = 0; i < contract.Objectives.Length; i++) {
                 var objective = contract.Objectives[i];
+                // Kill objectives: the client-hosted raid has no dedicated game server
+                // to report per-kill progress to the backend, so kills would never be
+                // saved. Auto-credit them on deploy so the objective can be completed
+                // (mirrors the player-kill auto-credit done in ActivateContract).
+                if (objective.Type == EYContractObjectiveType.Kills) {
+                    contractActive.Progress[i] = objective.MaxProgress;
+                    continue;
+                }
                 if (objective.Type != EYContractObjectiveType.OwnNumOfItem) {
                     continue;
                 }