🛡️ Sentinel: [CRITICAL] Fix SQL injection via sql.raw in jsonExtract

[Donach]

🚨 Severity: CRITICAL
💡 Vulnerability: The jsonExtract utility function used sql.raw to construct dynamic PostgreSQL JSON extraction paths, bypassing query parameterization and exposing the application to SQL injection if untrusted inputs were passed as the JSON path.
🎯 Impact: An attacker could craft a malicious JSON path string that alters the structure of the database query, potentially leading to unauthorized data disclosure, modification, or deletion.
🔧 Fix: Rewrote the jsonExtract function to use Drizzle's proper parameterization by explicitly casting dynamic parameters to ::text (e.g. ->> (${parts[0]}::text)) along with sql.join to safely build multi-level path extractions.
✅ Verification: Run pnpm --filter @agor/core test and verify that all core database tests pass and no new warnings appear.

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PR created automatically by Jules for task 8106088060992392657 started by @Donach

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