🛡️ Sentinel: [HIGH] Fix missing rate limiting on admin authentication endpoint

[ralksta]

• 🚨 Severity: HIGH
• 💡 Vulnerability: The admin authentication endpoint (/api/admin/auth/route.ts) is missing rate limiting. This lack of protection allows attackers to perform brute-force attacks against the admin password, potentially gaining unauthorized administrative access to the system.
• 🎯 Impact: If exploited, an attacker could brute-force the admin password, enabling unauthorized access to administrative features, leading to full system compromise or significant unauthorized actions.
• 🔧 Fix: Implemented rate limiting on the POST method in app/api/admin/auth/route.ts using the existing checkRateLimit utility. I've configured it with a strict limit of 5 requests per minute (ADMIN_AUTH_RPM) to prevent brute-force attempts.
• ✅ Verification: Tested locally by verifying the changes, running formatting, linting checks (pnpm lint), and the test suite (pnpm test).

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PR created automatically by Jules for task 14110142089684370232 started by @ralksta

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