直聊的种子历史改成逐条真多轮，不再靠块头文本猜轮次。

一条一个角色下拉加一整句正文，换行原样保留；旧盘里的纯文本在读盘时迁移，切得出轮次的转成条目，切不出的挪进史前设定免得悄悄丢掉。历史编辑器做成共用控件，预设工作台的用例与假历史也用同一套。

src/server/direct-chat-handlers.ts

@@ -233,6 +233,9 @@ function slotsFromBody(body: Record<string, unknown>): DirectChatShellSlots {
       typeof body.seedHistory === "string"
         ? body.seedHistory
         : EMPTY_SHELL_SLOTS.seedHistory,
+    seedMessages: Array.isArray(body.seedMessages)
+      ? (body.seedMessages as DirectChatShellSlots["seedMessages"])
+      : EMPTY_SHELL_SLOTS.seedMessages,
     loreAfter:
       typeof body.loreAfter === "string"
         ? body.loreAfter
@@ -319,6 +322,9 @@ export async function handleDirectChatApi(
               typeof body.seedHistory === "string"
                 ? body.seedHistory
                 : undefined,
+            seedMessages: Array.isArray(body.seedMessages)
+              ? (body.seedMessages as DirectChatShellSlots["seedMessages"])
+              : undefined,
             loreAfter:
               typeof body.loreAfter === "string" ? body.loreAfter : undefined,
             postTurn:
@@ -489,6 +495,7 @@ export async function handleDirectChatApi(
               systemPrompt: shell.systemPrompt,
               loreBefore: shell.loreBefore,
               seedHistory: shell.seedHistory,
+              seedMessages: shell.seedMessages,
               loreAfter: shell.loreAfter,
               postTurn: shell.postTurn,
             },
@@ -600,6 +607,7 @@ export async function handleDirectChatApi(
               systemPrompt: shell.systemPrompt,
               loreBefore: shell.loreBefore,
               seedHistory: shell.seedHistory,
+              seedMessages: shell.seedMessages,
               loreAfter: shell.loreAfter,
               postTurn: shell.postTurn,
             },
@@ -721,6 +729,7 @@ export async function handleDirectChatApi(
                 systemPrompt: shell.systemPrompt,
                 loreBefore: shell.loreBefore,
                 seedHistory: shell.seedHistory,
+                seedMessages: shell.seedMessages,
                 loreAfter: shell.loreAfter,
                 postTurn: shell.postTurn,
               },
@@ -909,6 +918,7 @@ export async function handleDirectChatApi(
           systemPrompt?: string;
           loreBefore?: string;
           seedHistory?: string;
+          seedMessages?: DirectChatShellSlots["seedMessages"];
           loreAfter?: string;
           postTurn?: string;
           presetId?: string | null;
@@ -928,6 +938,7 @@ export async function handleDirectChatApi(
                   systemPrompt: body.shell.systemPrompt ?? "",
                   loreBefore: body.shell.loreBefore ?? "",
                   seedHistory: body.shell.seedHistory ?? "",
+                  seedMessages: body.shell.seedMessages ?? [],
                   loreAfter: body.shell.loreAfter ?? "",
                   postTurn: body.shell.postTurn ?? "",
                 },