🔒 Fix missing input sanitization in astra_settings

[google-labs-jules]

🎯 What: The astra_settings parameter inside the antigravity_update_settings function in wordpress-plugin/antigravity_cors.php was being saved directly to the database without any sanitization.
⚠️ Risk: Because this is an array containing potentially complex data, it could allow an attacker to inject malicious code (Stored XSS) or corrupt the configuration, impacting the site's security and stability.
🛡️ Solution: Added a recursive sanitization function antigravity_sanitize_array that applies WordPress's built-in sanitize_text_field to all elements (both keys and values) of an array or object. This function is now used to sanitize $params['astra_settings'] before calling update_option().

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PR created automatically by Jules for task 7363141778393147437 started by @instituto-ops

[google-labs-jules]

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