feat(scenarios): 兼容非法配置并展示错误摘要

apps/scenarios/services.py

@@ -36,15 +36,15 @@ def _get_nested(config: dict, path: tuple[str, ...]):
 
 
 def validate_scenario(config: dict) -> dict:
-    # 只校验真正影响运行闭环的必填字段；
-    # 页面展示类字段如 applicable_questions 允许缺失，并在归一化阶段补默认值。
+    # 仅校验真正影响运行闭环的必填字段；
+    # 页面展示字段允许缺失，并在归一化阶段补默认值。
     for field_path in REQUIRED_FIELDS:
         _get_nested(config, field_path)
     return normalize_scenario(config)
 
 
 def normalize_scenario(config: dict) -> dict:
-    """补齐页面和其他模块常用的派生字段，减少模板中的条件判断。"""
+    """补齐页面和其它模块常用的派生字段，避免模板层重复判断。"""
     normalized = dict(config)
     normalized["applicable_questions"] = list(config.get("applicable_questions") or [])
     normalized["rag"] = dict(config.get("rag", {}))
@@ -62,16 +62,47 @@ def _scenario_files() -> list[Path]:
     return sorted([*config_dir.glob("*.yaml"), *config_dir.glob("*.yml")])
 
 
+def _read_yaml_file(path: Path) -> dict:
+    with path.open("r", encoding="utf-8") as file:
+        return yaml.safe_load(file) or {}
+
+
+def _collect_scenario_load_result() -> tuple[list[dict], list[dict]]:
+    """
+    统一读取配置目录中的所有场景文件。
+
+    返回值：
+    - scenarios: 校验通过的场景列表
+    - issues: 非法 YAML / 缺字段等错误摘要，供首页展示
+    """
+    scenarios = []
+    issues = []
+    for path in _scenario_files():
+        try:
+            config = _read_yaml_file(path)
+            scenarios.append(validate_scenario(config))
+        except (yaml.YAMLError, ScenarioValidationError) as exc:
+            issues.append(
+                {
+                    "file_name": path.name,
+                    "message": str(exc),
+                }
+            )
+    return scenarios, issues
+
+
 def list_scenarios() -> list[dict]:
     # 首页每次读取最新 YAML，便于复试现场快速改题。
-    scenarios = []
-    for path in _scenario_files():
-        with path.open("r", encoding="utf-8") as file:
-            config = yaml.safe_load(file) or {}
-        scenarios.append(validate_scenario(config))
+    scenarios, _issues = _collect_scenario_load_result()
     return scenarios
 
 
+def list_scenario_issues() -> list[dict]:
+    """返回配置异常摘要，便于页面明确提示而不是直接 500。"""
+    _scenarios, issues = _collect_scenario_load_result()
+    return issues
+
+
 def get_scenario(scenario_id: str) -> dict:
     for scenario in list_scenarios():
         if scenario["id"] == scenario_id: