重构会话管理，简化上下文存储逻辑

tests/routes/chatSession.test.ts

@@ -1,9 +1,12 @@
 import { describe, expect, it } from "bun:test";
 
 import {
+  buildPromptWithLearningContext,
   generateSessionTitle,
   shouldGenerateSessionTitle,
 } from "../../src/routes/chatSession.js";
+import { type SessionTurnRecord } from "../../src/history/store.js";
+import { type MemoryStore } from "../../src/memory/store.js";
 import { type OpencodeRuntimeAdapter } from "../../src/runtime/opencode.js";
 
 describe("shouldGenerateSessionTitle", () => {
@@ -71,3 +74,90 @@ describe("generateSessionTitle", () => {
     expect(titlePrompt).toContain("助手：三号泵站压力波动主要与夜间阀门开度变化有关。");
   });
 });
+
+describe("buildPromptWithLearningContext", () => {
+  const memoryStore = {
+    buildPromptSnapshot: async () => "",
+  } as unknown as MemoryStore;
+
+  it("prefers persisted frontend messages so aborted turns remain in restored context", async () => {
+    const prompt = await buildPromptWithLearningContext(
+      memoryStore,
+      "actor-1",
+      "project-1",
+      {
+        recentTurns: [],
+        persistedMessages: [
+          { role: "user", content: "先分析 3 号泵站夜间压力波动" },
+          {
+            role: "assistant",
+            content: "已定位到夜间阀门开度变化与压力波动时间段重合，下一步准备对比相邻支路。",
+            isError: true,
+          },
+          { role: "assistant", content: "⚠️ **请求已中断**", isError: true },
+        ],
+        message: "继续刚才的分析，并补充相邻支路影响",
+      },
+    );
+
+    expect(prompt).toContain("用户：先分析 3 号泵站夜间压力波动");
+    expect(prompt).toContain(
+      "助手：已定位到夜间阀门开度变化与压力波动时间段重合，下一步准备对比相邻支路。",
+    );
+    expect(prompt).not.toContain("⚠️ **请求已中断**");
+    expect(prompt).toContain("[Current user request]\n继续刚才的分析，并补充相邻支路影响");
+  });
+
+  it("falls back to history turns when frontend state is unavailable", async () => {
+    const recentTurns: SessionTurnRecord[] = [
+      {
+        id: "turn-1",
+        userMessage: "检查 DMA-2 夜间漏损异常",
+        assistantMessage: "DMA-2 在 02:00-04:00 出现持续最小夜流抬升。",
+        timestamp: new Date().toISOString(),
+        toolCallCount: 1,
+      },
+    ];
+
+    const prompt = await buildPromptWithLearningContext(
+      memoryStore,
+      "actor-1",
+      "project-1",
+      {
+        recentTurns,
+        message: "继续给出排查建议",
+      },
+    );
+
+    expect(prompt).toContain("用户：检查 DMA-2 夜间漏损异常");
+    expect(prompt).toContain("助手：DMA-2 在 02:00-04:00 出现持续最小夜流抬升。");
+  });
+
+  it("skips restored conversation injection when reusing an existing opencode session", async () => {
+    const prompt = await buildPromptWithLearningContext(
+      memoryStore,
+      "actor-1",
+      "project-1",
+      {
+        recentTurns: [
+          {
+            id: "turn-1",
+            userMessage: "上一轮问题",
+            assistantMessage: "上一轮回答",
+            timestamp: new Date().toISOString(),
+            toolCallCount: 0,
+          },
+        ],
+        persistedMessages: [
+          { role: "user", content: "旧问题" },
+          { role: "assistant", content: "旧回答" },
+        ],
+        message: "基于刚才结果继续分析",
+        restoreConversation: false,
+      },
+    );
+
+    expect(prompt).not.toContain("[Previous conversation context]");
+    expect(prompt).toBe("基于刚才结果继续分析");
+  });
+});