Fix bare except blocks that silently swallow all errors

[hobostay]

Summary

• Replace except Exception: pass with except ValueError: pass in the vLLM plugin registration code
• The broad Exception handler hides real bugs (TypeError, AttributeError, etc.) that indicate a genuine problem, not just "already registered"
• The transformers registry raises ValueError when a config class is already registered, so catching ValueError is sufficient

Details

Affected file: vllm_plugin/__init__.py (lines 40-53)

If the registration fails for a reason other than "already registered" (e.g., wrong argument types, missing attributes), the error would be silently swallowed and the model would malfunction later with no indication of the root cause.

Test plan

• Verify the vLLM plugin still loads correctly on first invocation
• Verify the plugin still works when loaded multiple times (already-registered case)
• Verify that genuine registration errors are now properly raised

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