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>

runner.js

@@ -0,0 +1,68 @@
+import { spawn } from 'child_process';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+// Path to sitespeed.io — works both locally and in Docker
+const SITESPEED_BIN = process.env.SITESPEED_BIN ||
+  join(__dirname, '..', 'sitespeed.io', 'bin', 'sitespeed.js');
+
+export function runTest(job, onLine) {
+  return new Promise((resolve, reject) => {
+    const outputFolder = join(__dirname, 'reports', job.id);
+
+    const args = [
+      SITESPEED_BIN,
+      job.url,
+      '--browser', job.browser,
+      '-n', String(job.runs),
+      '--outputFolder', outputFolder,
+      '--json',
+      '--sustainable.enable',
+      '--axe.enable',
+      '--coach',
+      '--headless',
+    ];
+
+    if (job.mobile) {
+      args.push('--mobile');
+    }
+
+    // In Docker we need --xvfb false and --browsertime.chrome.args=no-sandbox
+    if (process.env.IN_DOCKER) {
+      args.push('--browsertime.chrome.args', 'no-sandbox');
+      args.push('--browsertime.chrome.args', 'disable-dev-shm-usage');
+    }
+
+    onLine(`[runner] Starting: node ${args.slice(0, 3).join(' ')} ...`);
+    onLine(`[runner] Output folder: ${outputFolder}`);
+
+    const child = spawn('node', args, {
+      cwd: __dirname,
+      env: { ...process.env, DISPLAY: process.env.DISPLAY || ':99' },
+    });
+
+    child.stdout.on('data', (data) => {
+      const lines = data.toString().split('\n').filter(Boolean);
+      for (const line of lines) onLine(line);
+    });
+
+    child.stderr.on('data', (data) => {
+      const lines = data.toString().split('\n').filter(Boolean);
+      for (const line of lines) onLine(`[stderr] ${line}`);
+    });
+
+    child.on('close', (code) => {
+      if (code === 0) {
+        resolve(outputFolder);
+      } else {
+        reject(new Error(`sitespeed.io exited with code ${code}`));
+      }
+    });
+
+    child.on('error', (err) => {
+      reject(new Error(`Failed to spawn sitespeed.io: ${err.message}`));
+    });
+  });
+}