feat: refresh shared chat and server workflows

etc/servers/work-server/src/services/runtime-drain-service.ts

@@ -0,0 +1,56 @@
+type RuntimeDrainState = {
+  draining: boolean;
+  drainStartedAt: string | null;
+  activeHttpRequestCount: number;
+  activeWebSocketConnectionCount: number;
+};
+
+const state: RuntimeDrainState = {
+  draining: false,
+  drainStartedAt: null,
+  activeHttpRequestCount: 0,
+  activeWebSocketConnectionCount: 0,
+};
+
+function clampCount(value: number) {
+  return Number.isFinite(value) && value > 0 ? Math.trunc(value) : 0;
+}
+
+export function beginRuntimeDrain() {
+  state.draining = true;
+  state.drainStartedAt = new Date().toISOString();
+}
+
+export function endRuntimeDrain() {
+  state.draining = false;
+  state.drainStartedAt = null;
+}
+
+export function isRuntimeDraining() {
+  return state.draining;
+}
+
+export function trackHttpRequestStarted() {
+  state.activeHttpRequestCount += 1;
+}
+
+export function trackHttpRequestFinished() {
+  state.activeHttpRequestCount = clampCount(state.activeHttpRequestCount - 1);
+}
+
+export function trackWebSocketConnectionOpened() {
+  state.activeWebSocketConnectionCount += 1;
+}
+
+export function trackWebSocketConnectionClosed() {
+  state.activeWebSocketConnectionCount = clampCount(state.activeWebSocketConnectionCount - 1);
+}
+
+export function getRuntimeDrainSnapshot() {
+  return {
+    draining: state.draining,
+    drainStartedAt: state.drainStartedAt,
+    activeHttpRequestCount: state.activeHttpRequestCount,
+    activeWebSocketConnectionCount: state.activeWebSocketConnectionCount,
+  };
+}