feat(web): 项目级配置 + 会话命名/历史 + 设计文档纳入影响调查

- 会话支持 name/project 字段，上传要件定义后自动命名；前端侧边栏会话历史 + localStorage 恢复，顶部只显示会话名
- 新增 ProjectsStore（SQLite）与 /api/projects CRUD；绑定项目后 _rebuild_source 合并模板/规则/代码库/设计文档，上传区仅要件定义
- StructuredSource.design_docs 与 ImpactReport.design_references；影响调查新增既有设计文档确定性交叉引用（无 LLM）
- 同步更新 docs/design.md §12.7、README、_AI_USAGE_LOG.md；全量测试 558 通过，覆盖率 99.10%

tests/test_server_api.py

@@ -279,3 +279,71 @@ def test_real_mode_generate_without_key_500(tmp_path, monkeypatch):
     client.post(f"/api/sessions/{sid}/confirm-parse")
     r = client.post(f"/api/sessions/{sid}/generate", json={})
     assert r.status_code == 500
+
+
+# ---------- 项目配置（S6） ----------
+
+def test_create_and_list_projects(client):
+    body = {
+        "name": "stock", "display_name": "股票系统",
+        "template": str(_SAMPLE / "template_design_ja.docx"),
+        "write_instruction": "", "rules": [],
+        "existing_system_code_dir": "", "design_docs_dir": "",
+    }
+    r = client.post("/api/projects", json=body)
+    assert r.status_code == 200
+    assert r.json()["name"] == "stock"
+    lst = client.get("/api/projects").json()
+    assert any(p["name"] == "stock" for p in lst)
+    one = client.get("/api/projects/stock").json()
+    assert one["template"] == str(_SAMPLE / "template_design_ja.docx")
+
+
+def test_project_invalid_template_400(client):
+    r = client.post("/api/projects", json={"name": "p", "template": "/no/such.docx"})
+    assert r.status_code == 400
+    assert r.json()["detail"]["code"] == "PROJECT_CONFIG_INVALID"
+
+
+def test_delete_project(client):
+    client.post("/api/projects", json={"name": "p", "template": str(_SAMPLE / "template_design_ja.docx")})
+    assert client.delete("/api/projects/p").json()["deleted"] is True
+    assert client.get("/api/projects/p").status_code == 404
+
+
+def test_session_accepts_name_and_project(client):
+    r = client.post("/api/sessions", json={"user_id": "u1", "name": "我的会话", "project": "projA"})
+    assert r.status_code == 200
+    sid = r.json()["session_id"]
+    assert r.json()["name"] == "我的会话"
+    g = client.get(f"/api/sessions/{sid}").json()
+    assert g["name"] == "我的会话"
+    assert g["project"] == "projA"
+
+
+def test_session_list_includes_name_project(client):
+    client.post("/api/sessions", json={"user_id": "u1", "name": "n1", "project": "pA"})
+    r = client.get("/api/sessions", params={"user_id": "u1"}).json()
+    assert any(s["name"] == "n1" and s["project"] == "pA" for s in r)
+
+
+def test_generate_with_project_config_no_template_upload(client):
+    """绑定项目（含模板/规则）后，仅上传要件定义即可解析生成。"""
+    client.post("/api/projects", json={
+        "name": "projA", "template": str(_SAMPLE / "template_design_ja.docx"),
+        "write_instruction": str(_SAMPLE / "rules_design_ja.docx"),
+        "rules": [str(_SAMPLE / "rules_entry_ja.docx")],
+        "existing_system_code_dir": "", "design_docs_dir": "",
+    })
+    sid = client.post("/api/sessions", json={"user_id": "u1", "project": "projA"}).json()["session_id"]
+    # 仅上传要件定义
+    r = client.post(f"/api/sessions/{sid}/files", data={"file_type": "requirements"},
+                    files={"file": ("requirements_newdev.xlsx", (_SAMPLE / "requirements_newdev.xlsx").read_bytes())})
+    assert r.status_code == 200
+    p = client.post(f"/api/sessions/{sid}/start-parse")
+    assert p.status_code == 200, p.text
+    assert client.post(f"/api/sessions/{sid}/confirm-parse").status_code == 200
+    # 无既有系统 → 直接 writing，可生成
+    gen = client.post(f"/api/sessions/{sid}/generate", json={})
+    assert gen.status_code == 200, gen.text
+    assert client.get(f"/api/sessions/{sid}/result/download").status_code == 200