🛡️ Sentinel: [CRITICAL] Fix JPQL injection in RoomCategoryController

[ManupaKDU]

🚨 Severity: CRITICAL
💡 Vulnerability: User input from selectText and qry was concatenated directly into JPQL strings, exposing a JPQL injection vulnerability where an attacker could execute arbitrary JPQL commands, potentially extracting unauthorized data or modifying the database.
🎯 Impact: High. Arbitrary query injection.
🔧 Fix: Replaced string concatenation with parameterized queries using java.util.HashMap and the :q named parameter in both getSelectedItems and completeRoomCategory methods. Used JPQL upper() to maintain case-insensitivity securely.
✅ Verification: Ran mvn clean test successfully without regressions. Verified visually by printing out class methods.

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PR created automatically by Jules for task 8259371094353119272 started by @manupawickramasinghe

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