feat: initial Speedboard implementation

sitespeed.io web UI with Express/Pug/SQLite — port 3132.
Includes job queue, SSE live log, full metrics dashboard,
site history, CO2/axe/CWV sections, and Docker support.

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

queue.js

@@ -0,0 +1,82 @@
+import { runTest } from './runner.js';
+import { parseResults } from './parser.js';
+import { updateJobStatus, updateJobMetrics } from './db.js';
+
+// SSE subscribers: jobId -> Set of send functions
+const subscribers = new Map();
+
+// Job queue
+const queue = [];
+let running = false;
+
+export function subscribe(jobId, sendFn) {
+  if (!subscribers.has(jobId)) subscribers.set(jobId, new Set());
+  subscribers.get(jobId).add(sendFn);
+  return () => {
+    const set = subscribers.get(jobId);
+    if (set) {
+      set.delete(sendFn);
+      if (set.size === 0) subscribers.delete(jobId);
+    }
+  };
+}
+
+function emit(jobId, event, data) {
+  const set = subscribers.get(jobId);
+  if (!set) return;
+  const payload = `event: ${event}\ndata: ${JSON.stringify(data)}\n\n`;
+  for (const send of set) {
+    try { send(payload); } catch {}
+  }
+}
+
+export function enqueue(job) {
+  queue.push(job);
+  emit(job.id, 'status', { message: 'Queued, waiting for runner...', phase: 'queued' });
+  processQueue();
+}
+
+async function processQueue() {
+  if (running || queue.length === 0) return;
+  running = true;
+  const job = queue.shift();
+
+  try {
+    updateJobStatus(job.id, 'running');
+    emit(job.id, 'status', { message: 'Test starting...', phase: 'running' });
+
+    const outputFolder = await runTest(job, (line) => {
+      emit(job.id, 'log', { line });
+    });
+
+    emit(job.id, 'status', { message: 'Parsing results...', phase: 'parsing' });
+    updateJobStatus(job.id, 'running', { report_folder: outputFolder });
+
+    let metrics = {};
+    try {
+      metrics = await parseResults(outputFolder, job.url);
+      updateJobMetrics(job.id, metrics);
+    } catch (err) {
+      emit(job.id, 'log', { line: `[parser warning] ${err.message}` });
+    }
+
+    updateJobStatus(job.id, 'done', { report_folder: outputFolder });
+    emit(job.id, 'status', { message: 'Done!', phase: 'done' });
+    emit(job.id, 'done', { jobId: job.id });
+  } catch (err) {
+    updateJobStatus(job.id, 'error', { error_msg: err.message });
+    emit(job.id, 'error', { message: err.message });
+  } finally {
+    running = false;
+    // Small delay then process next
+    setTimeout(processQueue, 500);
+  }
+}
+
+export function getQueueLength() {
+  return queue.length;
+}
+
+export function isRunning() {
+  return running;
+}