Fix/zip bomb limits#93
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Problem
Default ZIP extraction limits were dangerously high:
A malicious actor could upload a crafted .crx extension (zip bomb)
to exhaust server memory and cause a Denial of Service (DoS).
Fix
Reduced defaults to safe values:
These limits can still be overridden via environment variables
if needed for specific deployments.
Security Impact
Prevents DoS attacks via crafted extension uploads.