Add standalone output for Docker deployment, gitignore deploy dir

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -25,6 +25,9 @@
 # database backups
 backup_*.sql
 
+# deployment repo (separate git repo for Bitbucket)
+/deploy/
+
 # debug
 npm-debug.log*
 yarn-debug.log*

next.config.ts

@@ -1,6 +1,7 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
+  output: "standalone",
   experimental: {
     // Allow large video uploads (up to 500MB) through the proxy
     proxyClientMaxBodySize: "500mb",