fix(realtime): replace axios with native HTTP client

Remove axios from the realtime server dependencies to avoid header injection risk,
switch Docker builds to npm ci, and bump the realtime image version to 1.0.15.

docker/coolify-realtime/Dockerfile

@@ -12,8 +12,8 @@ ARG CLOUDFLARED_VERSION
 WORKDIR /terminal
 RUN apk upgrade --no-cache && \
     apk add --no-cache openssh-client make g++ python3 curl
-COPY docker/coolify-realtime/package.json ./
-RUN npm i
+COPY docker/coolify-realtime/package*.json ./
+RUN npm ci
 RUN npm rebuild node-pty --update-binary
 COPY docker/coolify-realtime/soketi-entrypoint.sh /soketi-entrypoint.sh
 COPY docker/coolify-realtime/terminal-server.js /terminal/terminal-server.js