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fix: cap V8 heap explicitly to prevent OOM under Node 24 (#805)

Node 24 ships libuv >= 1.45, which (unlike the libuv 1.44 in Node 18)
correctly reads cgroup v2 memory limits. As a result Node now sizes the
default old-space heap to ~50% of the container limit instead of falling
back to host physical memory, leaving the service's working set above the
new, smaller ceiling and triggering "Reached heap limit" OOM crashes.

Set --max-old-space-size=1536 (~75% of the 2 GB container) so V8's heap
ceiling is deterministic and independent of auto-detection, while leaving
headroom for off-heap memory.

Also drop the --inspect="0.0.0.0:9229" flag, which exposed the V8
debugger (a remote-code-execution vector) on all network interfaces in
production.

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