feat(speedtest): worker + hourly cron + history/run routes

Adds speedtest pg-boss worker with injectable runner for testing, hourly
cron enqueue, and /api/speedtest/history (GET) + /run (POST, owner-only) routes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/jobs/workers/speedtest.js

@@ -0,0 +1,23 @@
+import { execFile } from 'node:child_process';
+import { promisify } from 'node:util';
+import * as repo from '../../db/repos/speedtest.js';
+import { log } from '../../log.js';
+const pexec = promisify(execFile);
+
+export const NAME = 'speedtest';
+
+// Default runner uses speedtest-cli --json (bits/s → Mbps). Swap binary/flags
+// here if the box has the Ookla `speedtest -f json` CLI instead.
+async function defaultRunner() {
+  const { stdout } = await pexec('speedtest-cli', ['--json'], { timeout: 120000 });
+  const j = JSON.parse(stdout);
+  return { down_mbps: j.download / 1e6, up_mbps: j.upload / 1e6, ping_ms: j.ping };
+}
+let runner = defaultRunner;
+export function _setRunner(fn) { runner = fn; }
+
+export async function handler(_job) {
+  const r = await runner();
+  await repo.record(r);
+  log.info(r, 'speedtest recorded');
+}