feat(file-summary): 接入文件汇总工作流触发

review_agent/file_summary/workflow_trigger.py

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+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from review_agent.models import Conversation, FileAttachment
+
+
+TRIGGER_KEYWORDS = ("自动汇总", "文件目录", "页数", "目录与页数", "文件清单")
+
+
+@dataclass(frozen=True)
+class TriggerResult:
+    should_start: bool
+    workflow_type: str = ""
+    reason: str = ""
+
+
+def evaluate_file_summary_trigger(conversation: Conversation, content: str) -> TriggerResult:
+    text = (content or "").strip()
+    if not any(keyword in text for keyword in TRIGGER_KEYWORDS):
+        return TriggerResult(should_start=False, reason="not_matched")
+
+    has_attachment = FileAttachment.objects.filter(
+        conversation=conversation,
+        is_active=True,
+    ).exclude(upload_status=FileAttachment.UploadStatus.DELETED).exists()
+    if not has_attachment:
+        return TriggerResult(should_start=False, reason="missing_attachment")
+
+    return TriggerResult(should_start=True, workflow_type="file_summary")