This PR breaks the large web and player bootstrap files into smaller modules with clearer ownership.

Web changes:

Split shared helpers, bootstrap logic, route groups, and upload-sync behavior out of web.js.
Kept web.js focused on wiring and server startup.
Fixed screen playlist reassignment so changing a screen’s playlist now triggers a refresh.
Fixed single-slide playlist refresh behavior so updates do not get stuck behind the current slide.
Player changes:

Split websocket/runtime handling into runtime.js.
Split playlist assembly and revision hashing into playlist.js.
Split onboarding and player HTTP routes into dedicated modules.
Split render utilities and template loading into render-helpers.js.
Kept player.js mostly as startup/orchestration.
Validation:

Rebuilt both services with Docker Compose.
Smoke-checked web and player routes after the refactor.
Verified get_errors was clean on the touched modules.

src/web/routes/admin-screen-commands.js

@@ -0,0 +1,47 @@
+module.exports = function registerAdminScreenCommandRoutes(app, deps) {
+  const pool = deps.pool;
+  const forwardPlayerCommand = deps.forwardPlayerCommand;
+
+  app.post('/admin/screens/:slug/commands', async function (req, res, next) {
+    try {
+      const slug = String(req.params.slug || '').trim();
+      const command = String((req.body && req.body.command) || req.query.command || '').trim().toLowerCase();
+      const connectionId = String((req.body && (req.body.connectionId || req.body.clientId)) || req.query.connectionId || req.query.clientId || '').trim();
+      const blackoutValue = req.body && Object.prototype.hasOwnProperty.call(req.body, 'blackout')
+        ? req.body.blackout
+        : req.query.blackout;
+
+      if (!slug) {
+        return res.status(400).json({ error: 'Screen slug is required' });
+      }
+      if (!command) {
+        return res.status(400).json({ error: 'Command is required' });
+      }
+
+      const [screenRows] = await pool.query('SELECT id, name, slug FROM screens WHERE slug = ?', [slug]);
+      if (!screenRows.length) {
+        return res.status(404).json({ error: 'Screen not found' });
+      }
+
+      const commandPayload = req.body && typeof req.body === 'object' && !Array.isArray(req.body)
+        ? Object.assign({}, req.body, { command: command })
+        : { command: command };
+      if (command === 'blackout' && blackoutValue !== undefined && commandPayload && typeof commandPayload === 'object') {
+        commandPayload.blackout = blackoutValue;
+      }
+
+      const result = connectionId
+        ? await forwardPlayerCommand(slug, commandPayload, connectionId)
+        : await forwardPlayerCommand(slug, commandPayload);
+
+      return res.json(Object.assign({
+        screen: screenRows[0],
+        screenSlug: slug,
+        command: command,
+        connectionId: connectionId || null
+      }, result && typeof result === 'object' ? result : {}));
+    } catch (error) {
+      next(error);
+    }
+  });
+};