feat(file-summary): 实现文件处理技能链路

tests/test_file_summary_inventory.py

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+from pathlib import Path
+import pytest
+
+from review_agent.file_summary.services.inventory import scan_files_to_items
+from review_agent.models import Conversation, FileSummaryBatch, FileSummaryItem
+
+
+pytestmark = pytest.mark.django_db
+
+
+def test_scan_files_to_items_preserves_relative_paths(tmp_path, django_user_model):
+    root = tmp_path / "work"
+    (root / "a").mkdir(parents=True)
+    (root / "a" / "one.pdf").write_bytes(b"pdf")
+    (root / "two.txt").write_text("x", encoding="utf-8")
+    user = django_user_model.objects.create_user(username="owner", password="pass")
+    conversation = Conversation.objects.create(user=user, title="会话")
+    batch = FileSummaryBatch.objects.create(conversation=conversation, user=user, batch_no="FS-I")
+
+    items = scan_files_to_items(batch=batch, roots=[root])
+
+    assert [item.relative_path for item in items] == ["a/one.pdf", "two.txt"]
+    assert FileSummaryItem.objects.filter(batch=batch).count() == 2
+    assert items[0].statistics_status == FileSummaryItem.StatisticsStatus.SKIPPED