fix: resolve semantic cache hit streaming response format issue #378
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When semantic cache hits occur with streaming requests, the cached response (in chat.completion JSON format) was being returned directly without converting to SSE format (chat.completion.chunk), causing streaming clients to receive malformed responses.
This fix:
Similar to the fix in a0f0581 for jailbreak/PII violations, this ensures consistent response format handling across all direct response scenarios.
Resolves streaming client hanging issues when cache hits occur.