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.

packages/db/src/redis.ts

@@ -0,0 +1,33 @@
+/**
+ * Redis connection wrapper. Provides one client for normal commands
+ * and a separate one for pub/sub (Redis requires dedicated connections
+ * for subscribe mode).
+ */
+import Redis from 'ioredis';
+
+export interface RedisPair {
+  /** For GET/SET/PUBLISH etc. */
+  client: Redis;
+  /** For SUBSCRIBE only — must not be used for other commands. */
+  subscriber: Redis;
+  close(): Promise<void>;
+}
+
+export function createRedis(url: string): RedisPair {
+  const client = new Redis(url, {
+    lazyConnect: false,
+    maxRetriesPerRequest: 3,
+    enableReadyCheck: true,
+  });
+  const subscriber = new Redis(url, {
+    lazyConnect: false,
+    maxRetriesPerRequest: null, // subscribers reconnect forever
+  });
+  return {
+    client,
+    subscriber,
+    async close() {
+      await Promise.all([client.quit().catch(() => {}), subscriber.quit().catch(() => {})]);
+    },
+  };
+}