Fix bypass via nested query parameters

[PopoviciMarian]

Make ArrayToJson recursive so all string leaf values are included regardless of nesting depth. Add tests for nested GET and POST parameter injection.

Summary by Aikido

Security Issues: 0	🔍 Quality Issues: 2	Resolved Issues: 0

⚡ Enhancements

• Added ZvalToJsonValue helper with depth limit and type checks

🐛 Bugfixes

• Fixed nested query parameter bypass by making ArrayToJson recursive

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