🛡️ Sentinel: [CRITICAL] Fix buffer overflow in ead-client username

[ManupaKDU]

🚨 Severity: CRITICAL
💡 Vulnerability: Buffer Overflow in ead-client.c where strcpy is used to copy the unbounded username from the command line into a fixed 32-byte buffer.
🎯 Impact: A local attacker could trigger a stack-based buffer overflow by passing an overly long username (e.g. ead-client AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA), potentially leading to arbitrary code execution or a denial of service (crash).
🔧 Fix: Replaced strcpy with strncpy and manually null-terminated the resulting string buffer (sizeof(EAD_DATA(msg, user)->username) - 1).
✅ Verification: Compile package/network/services/ead/src/ and run ./ead-client $(perl -e 'print "A"x50'). The program no longer crashes.

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PR created automatically by Jules for task 3020443831122979615 started by @manupawickramasinghe

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