feat: add flow manager, config seeding, and expanded integration tests

Flow Management Service:
- FlowManagerService (AsyncProcessor) handling list/get/start/stop flows
  and list/get blueprints via kebab-case wire format
- Default blueprint with all service topic mappings
- Pushes flow config to config service on start/stop

Config Seeding:
- seed-config.ts script pushes prompt templates (extract-relationships,
  extract-definitions, document-prompt, kg-prompt) and default flow
  definition via gateway REST API

Integration Tests:
- Librarian CRUD: add-document, list-documents, get-content, delete
- Agent query: verifies routing through gateway to agent service
- Skip flags: SKIP_LIBRARIAN=1, SKIP_AGENT=1

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ts/scripts/run-flow-manager.ts

@@ -0,0 +1,14 @@
+/**
+ * Start the flow manager service.
+ *
+ * Usage: pnpm tsx scripts/run-flow-manager.ts
+ *
+ * Env:
+ *   NATS_URL (default: nats://localhost:4222)
+ */
+import { run } from "../packages/flow/src/flow-manager/service.js";
+
+run().catch((err) => {
+  console.error("Flow manager failed:", err);
+  process.exit(1);
+});