feat: serve production build via PM2

npm start now builds all packages and starts PM2, with Express serving
the built client UI from client/dist. Adds dev-start.js for clean PM2
dev startup, PM2 convenience scripts, and uses local pm2 binary
throughout (no global install required).

Author: atomantic

.changelog/v0.9.0.md

@@ -0,0 +1,13 @@
+# v0.9.0
+
+## Added
+- Production serving via PM2: `npm start` builds all packages then starts PM2
+- Express serves built client UI from `client/dist` with SPA catch-all routing
+- `scripts/dev-start.js` for clean PM2-based dev startup (replaces concurrently)
+- PM2 convenience scripts: `pm2:start`, `pm2:stop`, `pm2:restart`, `pm2:logs`, `pm2:status`
+- `dev:stop` script for stopping PM2 processes
+
+## Changed
+- `update.sh` uses local pm2 binary instead of requiring global install
+- `ecosystem.config.cjs` adds `log_date_format` and `max_memory_restart` to server app
+- pm2 added as devDependency (no longer requires global install)

ecosystem.config.cjs

@@ -18,6 +18,8 @@ module.exports = {
       cwd: `${__dirname}/server`,
       interpreter: 'node',
       time: true,
+      log_date_format: 'YYYY-MM-DD HH:mm:ss',
+      max_memory_restart: '500M',
       env: {
         NODE_ENV: 'development',
         PORT: PORTS.API,