feat(server): ServerModule skeleton with shared ServerContext, worker runs engine + outbox relay (B6)

modules/{auth-settings,sources-identity,acquisition-organize,agent} placeholders listed in
SERVER_MODULES; ServerModule registers routes (under /api/v1, authenticated), tasks,
outbox routes, capabilities and background loops. bootstrap() builds ServerContext (db,
config, logger, events, engine, outbox writer, secrets placeholder, settings reader,
capability registry), fills unregistered tasks with stubs and rejects duplicate task or
outbox ownership. worker starts the OpenWorkflow worker, OutboxRelay and module start().
--role migrate also migrates the engine schema; api/worker connect without migrating.
tasks: TaskRegistry.has, migrateEngineSchema.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/server/src/http/sse.ts

@@ -5,11 +5,22 @@ import { ApiException } from "./errors.ts";
 
 type Listener = (e: EventEnvelope) => void;
 
+/**
+ * SSE 总线端口。模块与 SSE 路由只依赖这个接口;W2-A 把实现换成 PG NOTIFY + 持久化 seq 时接口不变。
+ */
+export interface EventBusPort {
+  readonly latestSeq: number;
+  publish<P>(type: string, payload: P): EventEnvelope<P>;
+  /** 取 seq > after 的事件;gap=true 表示起点已不可补读,客户端需重新拉快照 */
+  since(after: number): { events: EventEnvelope[]; gap: boolean };
+  subscribe(l: Listener): () => void;
+}
+
 /**
  * 进程内事件总线:序号自增,保留最近 capacity 条供断线补读。
  * 多进程部署时需换成 PG LISTEN/NOTIFY 或 outbox 投影(W2)。
  */
-export class EventBus {
+export class EventBus implements EventBusPort {
   private seq = 0;
   private readonly buffer: EventEnvelope[] = [];
   private readonly listeners = new Set<Listener>();
@@ -42,7 +53,7 @@ export class EventBus {
 }
 
 export interface SseOptions {
-  bus: EventBus;
+  bus: EventBusPort;
   keepaliveMs?: number;
 }