Phase 1: data pipeline (Postgres+Redis with in-memory fallback, mock telemetry publisher, WebSocket fan-out, hub /debug page)

- packages/db: postgres.js + ioredis wrapper, StateStore interface with
  InMemory + Postgres implementations, schema migration runner
- apps/api: refactored to use @kerbal-rt/db; live WebSocket hub subscribes
  to store changes and broadcasts to all clients
- apps/tools/mock-telemetry: Node script that generates realistic KSP
  state and POSTs to /api/v1/ingest at 1Hz (uses same keplerian math
  as the live-map renderer)
- apps/hub: new /debug page that connects to /api/v1/live and shows
  the live state
- ksp/README.md: documents Phase 1c (real kRPC bridge) and the two
  implementation options
- Tests: 17 total (5 kepler math, 5 db store, 5 API health/state,
  2 API WebSocket fan-out)

End-to-end verified: mock publisher → API → hub /debug page,
11 snapshots/5s over WebSocket, vessels advancing in mean anomaly.

apps/api/src/test-app.ts

@@ -1,5 +1,12 @@
 /**
  * Test-only Hono app export. Doesn't bind a port.
+ * Always uses in-memory store (no DB required for unit tests).
  */
+import { InMemoryStateStore } from '@kerbal-rt/db';
 import { buildApp } from './app.js';
-export const app = buildApp();
+
+export const app = buildApp({
+  store: new InMemoryStateStore(),
+  // Force-disable auth for tests; the auth path is tested separately.
+  ingestApiKey: null,
+});