chore(agent): move docker entrypoint script to scripts/

Relocate agent-entrypoint.sh from docker/ to scripts/ so operational
shell scripts live in one directory and update Dockerfile.agent copy path.

docker/Dockerfile.agent

@@ -38,7 +38,7 @@ ENV OPENFLARE_OPENRESTY_PATH=openresty \
     OPENFLARE_DATA_DIR=/data
 
 COPY --from=builder /build/bin/openflare-agent /usr/local/bin/openflare-agent
-COPY docker/agent-entrypoint.sh /usr/local/bin/openflare-agent-entrypoint.sh
+COPY scripts/agent-entrypoint.sh /usr/local/bin/openflare-agent-entrypoint.sh
 RUN chmod +x /usr/local/bin/openflare-agent-entrypoint.sh
 
 EXPOSE 80 443 18081

scripts/agent-entrypoint.sh

@@ -3,7 +3,6 @@ set -eu
 
 RUNTIME_USER="openflare"
 AGENT_BIN="/usr/local/bin/openflare-agent"
-OPENRESTY_BIN="/usr/local/openresty/nginx/sbin/nginx"
 
 fix_runtime_ownership() {
   for target in /data /etc/openflare; do