Replace go-openai with native client
Drop the github.com/sashabaranov/go-openai dependency in favor of an internal HTTP client. The LLM package is now split into: - llm.go: type definitions (Message, ChatRequest, ChatResponse, etc.) - client.go: client construction and configuration - client_completions.go: Completions and CompletionsStream methods - client_models.go: ListModels - client_tools.go: tool call execution CompletionsStream uses typed SSE events (delta, done, message) so the frontend can render progressive streaming output. Move tool.go and tool_test.go from internal/tool/ into internal/llm/ to co-locate the registry with the client that consumes it. Update job.go and service.go to use the new llm.Message types and Completions/CompletionsStream methods. Remove the Voice field from chat request/response (voice is now tracked via message metadata). Frontend: handle delta/done/message SSE events, render a streaming placeholder that receives progressive text deltas, and finalize with full message binding (reasoning, tool calls, actions).
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