fix(openai): add omitempty to chatFunction description/parameters#5020
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…fix strict gateway rejection
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问题
opencode.ai 等网关对工具定义有严格的 JSON schema 校验。Reasonix 发送的
chatFunction始终包含description: ""和parameters: null，在某些网关上导致：修复
给
chatFunction的Description和Parameters字段加上json:",omitempty"。空值不再序列化，减少 JSON 体积同时兼容严格网关。正常工具 schema 会继续通过
CanonicalizeSchema发送，不会牺牲 DeepSeek、MiniMax、MiMo 等 OpenAI-compatible 主供应商的工具调用。文件
internal/provider/openai/openai.go (+2/-2)
internal/provider/openai/openai_test.go (+32)
Cache-impact: low - OpenAI-compatible tool schema bytes change only when a tool has empty description or nil parameters; normal canonicalized tool schemas remain present.
Cache-guard: TestBuildRequestOmitsEmptyToolDescriptionAndParameters plus
go test ./internal/provider/openai ./internal/provider