diff --git a/frontend/src/app/composition/createAppServices.ts b/frontend/src/app/composition/createAppServices.ts
new file mode 100644
index 0000000..1e4b20f
--- /dev/null
+++ b/frontend/src/app/composition/createAppServices.ts
@@ -0,0 +1,62 @@
+import { AppRuntime } from '../orchestration/AppRuntime';
+import type {
+  ReminderApplicationDependencies,
+  ReminderApplicationPort,
+} from '../../features/reminder/application/interfaces';
+import {
+  MockLocalScheduleReader,
+  MockReminderApplication,
+  MockReminderDispositionSync,
+  MockReminderStateStore,
+} from '../../features/reminder/data/local';
+import { MockAudioPlayback } from '../../infrastructure/audio';
+import { MockLocationMonitor } from '../../infrastructure/location';
+import {
+  MockAlarmScheduler,
+  MockDeviceCapability,
+  MockPopup,
+  MockReminderRecovery,
+  MockReminderDelivery,
+  MockSystemNotification,
+  MockVibration,
+} from '../../infrastructure/notifications';
+import { MockTimeListener } from '../../shared/time';
+import { MockReminderPresenter } from '../../features/reminder/presentation';
+
+export type AppServices = {
+  runtime: AppRuntime;
+  reminder: ReminderApplicationPort;
+  reminderPorts: ReminderApplicationDependencies;
+};
+
+/** 提醒端口的组合根；当前所有具体适配器都是确定性的模拟实现。 */
+export function createAppServices(): AppServices {
+  const reminderPorts: ReminderApplicationDependencies = {
+    schedules: new MockLocalScheduleReader(),
+    time: new MockTimeListener(),
+    location: new MockLocationMonitor(),
+    alarms: new MockAlarmScheduler(),
+    delivery: new MockReminderDelivery(),
+    audio: new MockAudioPlayback(),
+    device: new MockDeviceCapability(),
+    presenter: new MockReminderPresenter(),
+    systemNotification: new MockSystemNotification(),
+    popup: new MockPopup(),
+    vibration: new MockVibration(),
+    recovery: new MockReminderRecovery(),
+    state: new MockReminderStateStore(),
+    dispositionSync: new MockReminderDispositionSync(),
+  };
+  const reminder = new MockReminderApplication(reminderPorts);
+
+  return {
+    runtime: new AppRuntime([
+      {
+        start: () => reminder.start(),
+        stop: () => reminder.stop(),
+      },
+    ]),
+    reminder,
+    reminderPorts,
+  };
+}
diff --git a/frontend/src/app/orchestration/AppRuntime.ts b/frontend/src/app/orchestration/AppRuntime.ts
new file mode 100644
index 0000000..86978b8
--- /dev/null
+++ b/frontend/src/app/orchestration/AppRuntime.ts
@@ -0,0 +1,99 @@
+export type RuntimeModule = {
+  start(): Promise<void> | void;
+  stop(): Promise<void> | void;
+};
+
+/** 协调应用生命周期模块，不在应用层放置业务规则。 */
+export class AppRuntime {
+  private started = false;
+  /** 串行化 start/stop，避免并发重入与半开状态。 */
+  private lifecycle: Promise<void> = Promise.resolve();
+
+  constructor(private readonly modules: readonly RuntimeModule[] = []) {}
+
+  async start(): Promise<void> {
+    const run = this.lifecycle.then(() => this.startInternal());
+    this.lifecycle = run.then(
+      () => undefined,
+      () => undefined,
+    );
+    return run;
+  }
+
+  async stop(): Promise<void> {
+    const run = this.lifecycle.then(() => this.stopInternal());
+    this.lifecycle = run.then(
+      () => undefined,
+      () => undefined,
+    );
+    return run;
+  }
+
+  private async startInternal(): Promise<void> {
+    if (this.started) return;
+
+    const startedModules: RuntimeModule[] = [];
+    try {
+      for (const module of this.modules) {
+        await module.start();
+        startedModules.push(module);
+      }
+      this.started = true;
+    } catch (error) {
+      const cleanupErrors = await stopAllBestEffort([...startedModules].reverse());
+      throw withCleanupErrors(error, cleanupErrors, 'AppRuntime start failed');
+    }
+  }
+
+  private async stopInternal(): Promise<void> {
+    if (!this.started) return;
+
+    const stopErrors = await stopAllBestEffort([...this.modules].reverse());
+    // 无论个别 stop 是否失败，都视为已退出 started，避免半关闭后重试重复 stop。
+    this.started = false;
+    if (stopErrors.length > 0) {
+      throw withCleanupErrors(undefined, stopErrors, 'AppRuntime stop failed');
+    }
+  }
+}
+
+async function stopAllBestEffort(modules: readonly RuntimeModule[]): Promise<unknown[]> {
+  const errors: unknown[] = [];
+  for (const module of modules) {
+    try {
+      await module.stop();
+    } catch (error) {
+      errors.push(error);
+    }
+  }
+  return errors;
+}
+
+function withCleanupErrors(
+  primary: unknown | undefined,
+  cleanupErrors: readonly unknown[],
+  message: string,
+): Error {
+  if (cleanupErrors.length === 0) {
+    return primary instanceof Error ? primary : new Error(String(primary));
+  }
+
+  const parts: unknown[] = [];
+  if (primary !== undefined) {
+    parts.push(primary);
+  }
+  parts.push(...cleanupErrors);
+
+  if (typeof AggregateError === 'function') {
+    return new AggregateError(parts, message);
+  }
+
+  const detail = parts
+    .map((error) => (error instanceof Error ? error.message : String(error)))
+    .join('; ');
+  const fallback = new Error(`${message}: ${detail}`);
+  if (primary instanceof Error) {
+    fallback.cause = primary;
+  }
+  return fallback;
+}