feat: fence periodic turn daemon execution

packages/infra/prisma/game.prisma

@@ -77,6 +77,16 @@ model InputEvent {
   @@map("input_event")
 }
 
+model TurnDaemonLease {
+  profile       String   @id
+  ownerId       String   @map("owner_id")
+  leaseUntil    DateTime @map("lease_until")
+  fencingEpoch  BigInt   @default(1) @map("fencing_epoch")
+  heartbeatAt   DateTime @default(now()) @map("heartbeat_at")
+
+  @@map("turn_daemon_lease")
+}
+
 model WorldState {
     id           Int      @id @default(autoincrement())
     scenarioCode String   @map("scenario_code")

packages/infra/prisma/migrations/20260725002000_add_turn_daemon_lease/migration.sql

@@ -0,0 +1,9 @@
+CREATE TABLE "turn_daemon_lease" (
+    "profile" TEXT NOT NULL,
+    "owner_id" TEXT NOT NULL,
+    "lease_until" TIMESTAMP(3) NOT NULL,
+    "fencing_epoch" BIGINT NOT NULL DEFAULT 1,
+    "heartbeat_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "turn_daemon_lease_pkey" PRIMARY KEY ("profile")
+);

packages/infra/src/db.ts

@@ -27,4 +27,5 @@ export interface DatabaseClient {
     inheritanceResult: GamePrisma.InheritanceResultDelegate;
     inheritanceUserState: GamePrisma.InheritanceUserStateDelegate;
     inputEvent: GamePrisma.InputEventDelegate;
+    turnDaemonLease: GamePrisma.TurnDaemonLeaseDelegate;
 }