Fix Dockerfile permissions, add nextjs standalone output, and graceful config load

src/lib/config.ts

@@ -37,6 +37,9 @@ export interface Config {
 }
 
 export function readConfig(): Config {
+  if (!fs.existsSync(CONFIG_PATH)) {
+    return { sites: [], databases: [], services: [] }
+  }
   const raw = fs.readFileSync(CONFIG_PATH, 'utf-8')
   return JSON.parse(raw)
 }