feat(gateway): stream release progress logs

packages/infra/prisma/gateway-migrations/20260809000000_add_gateway_release_logs/migration.sql

@@ -0,0 +1,16 @@
+CREATE TABLE "gateway_release_log" (
+    "id" BIGSERIAL NOT NULL,
+    "operation_id" TEXT NOT NULL,
+    "level" TEXT NOT NULL,
+    "phase" TEXT NOT NULL,
+    "message" TEXT NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "gateway_release_log_pkey" PRIMARY KEY ("id"),
+    CONSTRAINT "gateway_release_log_operation_id_fkey"
+        FOREIGN KEY ("operation_id") REFERENCES "gateway_release_operation"("id")
+        ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+CREATE INDEX "gateway_release_log_operation_id_id_idx"
+    ON "gateway_release_log" ("operation_id", "id");