feat(qa-center): 问答中心左侧栏改造（0616 需求 2-5）

- 多智能体会商：Step1 落地左栏「业务链(public 前3) + 分析记录」；点链=勾选(autoChainResult)，第一步澄清后点「进入研讨」才按链执行
- zzJC/zzXD：独立模块路由 /page/strategy/qa/{zzjc,zzxd}，常驻左栏（按 agent 标签分组 + 仅本模块会话的聊天记录），点智能体模块内切换不跳页，默认落地配置类型下首个智能体
- zzJC/zzXD admin 设置：左栏齿轮→单选类型(TDesign)配置面板+智能体预览；后端 system_settings.agent_modules 持久化（GET 开放/PUT admin）+ test_agent_modules
- 课题研究：左栏「研究模板(文章类型) + 笔记本」；模板点击预填表单，笔记本点击设为素材来源（selectedNotebookId 上提 WritingFormContext）
- 通用问答：全量模式历史侧栏默认展开

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

offline-backend-20260512/backend/tests/test_agent_modules.py

@@ -0,0 +1,60 @@
+"""Tests for the admin-configured「按类型聚合」module → agent-tag config.
+
+Backs the zzJC / zzXD module left sidebar (需求 0616 #3/#4): an admin picks
+which agent tags belong to the module, persisted in ``system_settings.json``.
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+from deerflow.config import system_settings as ss
+
+
+@pytest.fixture
+def tmp_runtime_home(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> Path:
+    """Redirect ``runtime_home()`` to a per-test tmp dir."""
+
+    def fake_home() -> Path:
+        return tmp_path
+
+    monkeypatch.setattr(ss, "runtime_home", fake_home)
+    return tmp_path
+
+
+def test_load_returns_empty_modules_when_missing(tmp_runtime_home: Path) -> None:
+    settings = ss.load_system_settings()
+    assert settings.agent_modules.modules == {}
+    assert ss.get_module_tag_ids(settings.agent_modules, "zzjc") == []
+
+
+def test_set_module_tag_ids_dedupes_and_strips() -> None:
+    base = ss.AgentModuleSettings()
+    updated = ss.set_module_tag_ids(base, "zzjc", ["  t1 ", "t2", "t1", "", "  "])
+    assert updated.modules["zzjc"] == ["t1", "t2"]
+    # Original is untouched (returns a copy).
+    assert base.modules == {}
+
+
+def test_set_module_tag_ids_keeps_other_modules() -> None:
+    base = ss.set_module_tag_ids(ss.AgentModuleSettings(), "zzjc", ["t1"])
+    both = ss.set_module_tag_ids(base, "zzxd", ["t2", "t3"])
+    assert ss.get_module_tag_ids(both, "zzjc") == ["t1"]
+    assert ss.get_module_tag_ids(both, "zzxd") == ["t2", "t3"]
+
+
+def test_save_then_load_roundtrips(tmp_runtime_home: Path) -> None:
+    current = ss.load_system_settings()
+    updated = ss.set_module_tag_ids(current.agent_modules, "zzjc", ["tag-a", "tag-b"])
+    ss.save_system_settings(current.model_copy(update={"agent_modules": updated}))
+
+    file_path = tmp_runtime_home / "system_settings.json"
+    assert file_path.is_file()
+    saved = json.loads(file_path.read_text(encoding="utf-8"))
+    assert saved["agent_modules"]["modules"]["zzjc"] == ["tag-a", "tag-b"]
+
+    reloaded = ss.load_system_settings()
+    assert ss.get_module_tag_ids(reloaded.agent_modules, "zzjc") == ["tag-a", "tag-b"]