AssetMgr: Add SEH protection against accessing freed prototype pointers

[seer-by-sentry]

Fixes CLIENT-HS. The issue was that: Prototype hash table traversal uses dangling pointer to deleted object's name, causing read access violation in __ascii_stricmp.

• Added a defensive check using Structured Exception Handling (SEH) to protect against accessing freed/invalid PrototypeClass pointers in the PrototypeHashTable.
• The SEH __try and __except block catches access violations that may occur when dereferencing dangling pointers in the hash chain.
• If an access violation is caught, the loop is broken to prevent further traversal of the potentially corrupted hash chain, mitigating use-after-free scenarios.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 2020459

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