9318336f62
Implement full OpenAI-compatible tool-calling support across the proxy, enabling OpenCode to use llm-proxy as its sole LLM backend. - Add 9 tool-calling types (Tool, FunctionDef, ToolChoice, ToolCall, etc.) - Update ChatCompletionRequest/ChatMessage/ChatStreamDelta with tool fields - Update UnifiedRequest/UnifiedMessage to carry tool data through the pipeline - Shared helpers: messages_to_openai_json handles tool messages, build_openai_body includes tools/tool_choice, parse/stream extract tool_calls from responses - Gemini: full OpenAI<->Gemini format translation (functionDeclarations, functionCall/functionResponse, synthetic call IDs, tool_config mapping) - Gemini: extract duplicated message-conversion into shared convert_messages() - Server: SSE streams include tool_calls deltas, finish_reason='tool_calls' - AggregatingStream: accumulate tool call deltas across stream chunks - OpenAI provider: add o4- prefix to supports_model()