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

Cargo.lock

@@ -779,6 +779,20 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "dashmap"
+version = "6.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6361d5c062261c78a176addb82d4c821ae42bed6089de0e12603cd25de2059c"
+dependencies = [
+ "cfg-if",
+ "crossbeam-utils",
+ "hashbrown 0.14.5",
+ "lock_api",
+ "once_cell",
+ "parking_lot_core",
+]
+
 [[package]]
 name = "data-encoding"
 version = "2.11.0"
@@ -835,6 +849,7 @@ dependencies = [
  "async-trait",
  "base64 0.22.1",
  "chrono",
+ "dashmap",
  "df-ai",
  "df-execute",
  "df-ideas",
@@ -877,9 +892,9 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "async-trait",
+ "bytes",
  "df-ai-core",
  "df-types",
- "eventsource-stream",
  "futures",
  "rand 0.8.6",
  "reqwest 0.12.28",
@@ -1295,17 +1310,6 @@ dependencies = [
  "pin-project-lite",
 ]
 
-[[package]]
-name = "eventsource-stream"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74fef4569247a5f429d9156b9d0a2599914385dd189c539334c625d8099d90ab"
-dependencies = [
- "futures-core",
- "nom",
- "pin-project-lite",
-]
-
 [[package]]
 name = "fallible-iterator"
 version = "0.3.0"
@@ -2553,12 +2557,6 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
 
-[[package]]
-name = "minimal-lexical"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
-
 [[package]]
 name = "miniz_oxide"
 version = "0.8.9"
@@ -2661,16 +2659,6 @@ dependencies = [
  "memoffset",
 ]
 
-[[package]]
-name = "nom"
-version = "7.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
-dependencies = [
- "memchr",
- "minimal-lexical",
-]
-
 [[package]]
 name = "nu-ansi-term"
 version = "0.50.3"