🛡️ Sentinel: [HIGH] Fix Unconstrained Resource Consumption in API Token Creation

[arumes31]

🚨 Severity: HIGH
💡 Vulnerability: Unconstrained Resource Consumption (CWE-400)
🎯 Impact: A malicious user could submit extremely large strings for API token fields (name, permissions, IP ranges), leading to memory exhaustion and database bloat.
🔧 Fix: Implemented strict maximum length checks on name, requestedPerms, and allowedIPs early in the CreateAPIToken handler in internal/api/auth_handlers.go.
✅ Verification: Review the explicit length limits applied in CreateAPIToken (255 for name, 1024 for perms, 2048 for IPs) and note the successful execution of tests.

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PR created automatically by Jules for task 13271464012187772003 started by @arumes31

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