fix(openai): bridge oversized websocket requests

[xlx0852]

Summary

• make the OpenAI Responses WS client read limit configurable and bridge oversized first frames through HTTP/SSE while keeping the downstream WebSocket open
• replay collected tool-call context for bridged and recovered turns so function_call_output can continue without previous_response_id
• allow store-disabled WS sessions to recover from stale upstream connections when replay context is available

Tests

• go test ./...
• mvn compile skipped: no pom.xml in this Go project

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