fix(review): 修正同词不同曲合并逻辑和状态显示

@@ -1359,6 +1359,10 @@
                 <span style="flex:1">
                   <b>${esc(query.review_status === 'approved_import' && query.staging_status === 'imported'
                     ? '确认不重复（已入库）'
+                    : query.merge_diff_type === 'diff_lyric_same_melody' && query.staging_status === 'imported'
+                      ? '同曲不同词（已入库）'
+                      : query.merge_diff_type === 'same_lyric_diff_melody' && query.staging_status === 'skipped'
+                        ? '同词不同曲（已合并）'
                         : query.merge_diff_type
                           ? `${_DB_REVIEW_LABELS[query.merge_diff_type] || query.merge_diff_type}`
                           : query.review_status === 'rejected_duplicate' && query.staging_status === 'skipped'

@@ -894,7 +894,7 @@ def _import_approved_staging(source_ids: list[str] | None = None) -> dict[str, o
                     str(exc),
                 ) from exc
             inserted_count = cursor.rowcount
-            source_placeholders = ",".join(["%s"] * len(approved_source_ids))
+            source_placeholders = ",".join(["%s"] * len(all_import_source_ids))
             cursor.execute(
                 f"""
                 SELECT source_song_id, id AS target_id
@@ -933,8 +933,12 @@ def _import_approved_staging(source_ids: list[str] | None = None) -> dict[str, o
             target = cursor.fetchone()
             if not target:
                 raise RuntimeError(f"重复目标已失效: target_id={target_id}")
-            merged_lyricist = _merge_author_field(target.get("lyricist"), duplicate_row.get("lyricist"))
-            merged_composer = _merge_author_field(target.get("composer"), duplicate_row.get("composer"))
+            merge_diff = duplicate_row.get("merge_diff_type") or ""
+            # 同词不同曲：仅合并词作者，不合并曲作者（旋律不同）
+            merge_lyricist = True
+            merge_composer = merge_diff != "same_lyric_diff_melody"
+            merged_lyricist = _merge_author_field(target.get("lyricist"), duplicate_row.get("lyricist")) if merge_lyricist else ""
+            merged_composer = _merge_author_field(target.get("composer"), duplicate_row.get("composer")) if merge_composer else ""
             changed = False
             if merged_lyricist:
                 cursor.execute(
@@ -1502,6 +1506,14 @@ class Handler(BaseHTTPRequestHandler):
             finalized.extend(
                 {
                     "source_id": source_id,
+                    "review_decision": "import",
+                    "review_note": "同曲不同词，已入库",
+                }
+                for source_id in result.get("diff_lyric_source_ids", [])
+            )
+            finalized.extend(
+                {
+                    "source_id": source_id,
                     "review_decision": "duplicate_merged",
                     "review_note": "确认重复，词/曲作者已增量合并到已有记录",
                 }