refactor(question_gen): reduce check_forbidden_material complexity to A(3)

Extract _match_any helper and declarative _FORBIDDEN_MATERIAL_RULES table
to replace repetitive per-category for-loops. Reduces cyclomatic complexity
from C(11) to A(3).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/question_gen/postprocess.py

@@ -253,6 +253,29 @@ def has_time_anchor(question_text: str) -> bool:
     return any(pattern.search(question_text) for pattern in _TIME_ANCHOR_PHRASES)
 
 
+def _match_any(text: str, patterns: list[re.Pattern[str]]) -> bool:
+    """判断文本是否匹配任一正则模式。
+
+    参数:
+        text: 待检测文本。
+        patterns: 预编译正则列表。
+
+    返回:
+        True 表示至少命中一条模式。
+    """
+    return any(p.search(text) for p in patterns)
+
+
+# 素材禁区规则表：(模式列表, 违规描述)
+_FORBIDDEN_MATERIAL_RULES: list[tuple[list[re.Pattern[str]], str]] = [
+    (_T1_INSTANT_ACTION_PATTERNS, "T1 违规: 素材包含瞬时动作描述，不适合出题"),
+    (_T1_SCOREBOARD_PATTERNS, "T1 违规: 素材包含记分牌时序信息，不适合出题"),
+    (_T1_NO_DIALOGUE_CAUSAL_PATTERNS, "T1 违规: 素材缺乏对白因果线索，不适合出题"),
+    (_T7_OPTION_REPETITION_PATTERNS, "T7 违规: 素材暗示可能产生重复选项"),
+    (_T7_COUNTING_AMBIGUITY_PATTERNS, "T7 违规: 素材包含计数边界含糊描述"),
+]
+
+
 def check_forbidden_material(source_nodes_text: str, task_type: str) -> list[str]:
     """出题禁区：检测 T1 类素材和 T7 噪声模式。
 
@@ -272,39 +295,11 @@ def check_forbidden_material(source_nodes_text: str, task_type: str) -> list[str
     返回:
         违规描述列表，空列表表示通过。
     """
-    violations: list[str] = []
-
-    # Phase 1: T1 瞬时动作检测
-    for pattern in _T1_INSTANT_ACTION_PATTERNS:
-        if pattern.search(source_nodes_text):
-            violations.append("T1 违规: 素材包含瞬时动作描述，不适合出题")
-            break
-
-    # Phase 2: T1 记分牌时序检测
-    for pattern in _T1_SCOREBOARD_PATTERNS:
-        if pattern.search(source_nodes_text):
-            violations.append("T1 违规: 素材包含记分牌时序信息，不适合出题")
-            break
-
-    # Phase 3: T1 无对白因果检测
-    for pattern in _T1_NO_DIALOGUE_CAUSAL_PATTERNS:
-        if pattern.search(source_nodes_text):
-            violations.append("T1 违规: 素材缺乏对白因果线索，不适合出题")
-            break
-
-    # Phase 4: T7 选项重复检测
-    for pattern in _T7_OPTION_REPETITION_PATTERNS:
-        if pattern.search(source_nodes_text):
-            violations.append("T7 违规: 素材暗示可能产生重复选项")
-            break
-
-    # Phase 5: T7 计数边界口径含糊检测
-    for pattern in _T7_COUNTING_AMBIGUITY_PATTERNS:
-        if pattern.search(source_nodes_text):
-            violations.append("T7 违规: 素材包含计数边界含糊描述")
-            break
-
-    return violations
+    return [
+        message
+        for patterns, message in _FORBIDDEN_MATERIAL_RULES
+        if _match_any(source_nodes_text, patterns)
+    ]
 
 
 def run_postprocess(