chore(docker): harden Dockerfile, disable telemetry, add .dockerignore

.dockerignore

@@ -0,0 +1,18 @@
+# Ignore node modules and build output
+node_modules
+.next
+out
+
+# Ignore environment files
+.env
+.env.*
+!.env.example
+
+# VCS
+.git
+.gitignore
+
+# OS/editor noise
+.DS_Store
+.vscode
+*.log

Dockerfile

@@ -19,4 +19,7 @@ EXPOSE 3000
 
 # HF Spaces provides $PORT. Start Next.js on that port and bind to all interfaces.
 ENV HOST=0.0.0.0
+# Disable telemetry and ensure production env
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV NODE_ENV=production
 CMD ["sh", "-c", "npm start -- -p ${PORT:-3000}"]