🛡️ Sentinel: Fix potential zip bomb DoS in info.json decompression

[TheDragonSoft]

🚨 Severity: MEDIUM
💡 Vulnerability: Unbounded decompression when reading info.json from mod zip archives.
🎯 Impact: An untrusted or malformed zip with an oversized info.json could cause high memory consumption or OOM DoS during library scanning.
🔧 Fix: Bounded reading of info.json to MAX_INFO_JSON_SIZE (2 MiB) in mod_store.rs and downloader.rs.
✅ Verification: Added unit test test_oversized_info_json_rejected in mod_store.rs and verified all 142 Rust tests pass.

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PR created automatically by Jules for task 17768550245595021939 started by @TheDragonSoft

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