chore: clean up repo structure

- Add node_modules/, test-results/, e2e-report/, .omp/ to .gitignore
- Remove throwaway debug scripts (debug-pw*.js, debug-login-dom.js)
- Remove empty mock-server/ directory
- Untrack harness artifact (.omp/plans/)
- Add missing project files to git (e2e tests, Dockerfiles, tooling configs)

Dockerfile.openwrt

@@ -0,0 +1,29 @@
+FROM openwrt/rootfs:latest
+
+# Install LuCI, bootstrap theme, and dependencies.
+# Build this image with podman (NOT docker buildx) because Podman-backed Docker
+# seccomp blocks uclient-fetch syscalls at a level BuildKit cannot override.
+RUN mkdir -p /etc/apk/repositories.d /var/lock /var/run /www && \
+    printf \
+'https://downloads.openwrt.org/snapshots/targets/x86/64/packages/packages.adb\n\
+https://downloads.openwrt.org/snapshots/packages/x86_64/base/packages.adb\n\
+https://downloads.openwrt.org/snapshots/packages/x86_64/luci/packages.adb\n\
+https://downloads.openwrt.org/snapshots/packages/x86_64/packages/packages.adb\n\
+https://downloads.openwrt.org/snapshots/packages/x86_64/routing/packages.adb\n' \
+    > /etc/apk/repositories.d/distfeeds.list && \
+    apk add --no-cache --allow-untrusted \
+      luci-base luci-compat luci-mod-admin-full luci-proto-ppp \
+      luci-theme-bootstrap \
+      uhttpd uhttpd-mod-ubus ucode-mod-lua \
+      ca-certificates curl
+
+# Application files (self-contained image; compose may override with volumes)
+COPY root/usr/sbin/zt-gateway-switch /usr/sbin/zt-gateway-switch
+RUN chmod +x /usr/sbin/zt-gateway-switch && \
+    rm -f /var/run/zt-gateway-drain.* /tmp/zt-gw-stderr /tmp/zt-gw-out-*
+
+COPY docker/openwrt-luci-entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 80
+ENTRYPOINT ["/entrypoint.sh"]