🛡️ Sentinel: [HIGH] Fix code injection vulnerability in pandas query string interpolation

[karthik642006]

🚨 Severity: HIGH
💡 Vulnerability: Code injection vulnerability via Pandas query string interpolation. The codebase widely used df.query(f"column == '{user_variable}'") which passes user-controlled variables through f-strings directly into the Pandas evaluation backend, allowing potential code execution or data manipulation (comparable to SQL injection).
🎯 Impact: If exploited via maliciously formatted user input containing unescaped quotes or Python injection syntax, an attacker could manipulate application logic, extract unauthorized data, or execute arbitrary Python code.
🔧 Fix: Refactored unsafe f-string query calls to use standard, safe Pandas boolean indexing (e.g., df.loc[df["column"] == val]). This prevents the evaluation of strings as code while retaining the same functionality.
✅ Verification: Verified by passing the tests/test_util.py, tests/anoph/test_genome_features.py, and tests/anoph/test_frq_base.py test suites.

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PR created automatically by Jules for task 3732614202706786410 started by @karthik642006

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