修复: DeepSeek 400 全量扫描 + 队列 per-conv 隔离

- openai_compat: 扫描所有 assistant 消息剥离 orphan tool_calls（原仅查末条）
- queue 加 conversationId 字段，按会话精准 drain
- regenerate/editMessage 只清本会话排队消息
- newConversation 保留旧会话排队消息
- AiError 只清出错会话的队列项

crates/df-ai/Cargo.toml

@@ -14,9 +14,9 @@ anyhow = { workspace = true }
 tracing = { workspace = true }
 
 # HTTP + 流式
-reqwest = { version = "0.12", features = ["stream", "json"] }
+reqwest = { version = "0.12", features = ["stream", "json", "rustls-tls"] }
+bytes = "1"
 futures = "0.3"
-eventsource-stream = "0.2"
 rand = "0.8"
 
 [dev-dependencies]