feat: SheetDetector 类型识别（名称/表头关键词）

tests/test_sheet_detector.py

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+from genesis.data_models import SheetType
+from genesis.parsers.sheet_detector import detect_sheet_type
+
+
+def test_detect_by_sheet_name():
+    assert detect_sheet_type("機能一覧", []) == SheetType.FUNCTION
+    assert detect_sheet_type("画面一覧", []) == SheetType.SCREEN
+    assert detect_sheet_type("帳票一覧", []) == SheetType.REPORT
+    assert detect_sheet_type("DB定義", []) == SheetType.DATABASE
+    assert detect_sheet_type("IF定義", []) == SheetType.INTERFACE
+    assert detect_sheet_type("バッチ一覧", []) == SheetType.BATCH
+    assert detect_sheet_type("コード管理", []) == SheetType.MASTER
+
+
+def test_detect_by_header_keyword():
+    matrix = [["帳票ID", "帳票名"], ["TB1", "月次"]]
+    assert detect_sheet_type("補充シート", matrix) == SheetType.REPORT
+
+
+def test_unknown_is_generic():
+    assert detect_sheet_type("メモ", [["随筆"]]) == SheetType.GENERIC