🛡️ Sentinel: [HIGH] Fix JPQL Injection in ApiMembership

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: String concatenation in JPQL queries with .getId() parameter causing statement cache pollution and potential injection risks.
🎯 Impact: Polluting the query statement cache or possible injection vectors.
🔧 Fix: Replaced string concatenations with strictly parameterized maps.
✅ Verification: mvn clean test has verified that no functionality is broken and all 125 test suites pass.

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PR created automatically by Jules for task 2605670326339109703 started by @manupawickramasinghe

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