Add Drone CI pipeline and static-only nginx serving for dev deploy

Dockerfile

@@ -41,6 +41,14 @@ RUN sh -c "ng build --output-path=/dist $BUILD_ENVIRONMENT_OPTIONS"
 ###############
 FROM $NGINX_IMAGE
 
+# envsubst (gettext) alpine-slim me nahi hota — runtime env.js generation ke
+# liye zaroori hai, isliye explicitly install kar rahe hain.
+RUN apk add --no-cache gettext
+
+# Static-only nginx config (SPA fallback, no API proxy). Stock default.conf
+# ko replace karta hai taaki deep-link refresh par 404 na aaye.
+COPY nginx.spa.conf /etc/nginx/conf.d/default.conf
+
 COPY --from=builder /dist/browser /usr/share/nginx/html
 
 EXPOSE 80