HEL-177: 公司端按方案 A 实现转账往来四层页面

工作台概览小卡 + 侧栏入口；总览/对方汇总/明细/原始流水抽屉接入 HEL-175/176 接口；无期初时展示期间净变动；模块内用 info 品蓝。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

server.py

@@ -2439,10 +2439,12 @@ class AppHandler(SimpleHTTPRequestHandler):
                 SELECT r.id, r.source_row, r.transaction_at, r.income, r.expense,
                        r.own_account, r.own_name, r.counterparty_account,
                        r.counterparty_name, r.summary, r.reference,
-                       s.sheet_name, b.company_id AS batch_company_id
+                       s.sheet_name, b.id AS import_batch_id,
+                       f.original_filename, b.company_id AS batch_company_id
                 FROM source_rows r
                 JOIN sheet_batches s ON s.id = r.sheet_batch_id
                 JOIN import_batches b ON b.id = s.import_batch_id
+                JOIN source_files f ON f.id = b.source_file_id
                 WHERE r.id = ?
                 """,
                 (observation["source_row_id"],),
@@ -2459,9 +2461,16 @@ class AppHandler(SimpleHTTPRequestHandler):
                     "income": row["income"],
                     "expense": row["expense"],
                     "batch_company_id": row["batch_company_id"],
+                    "import_batch_id": row["import_batch_id"],
+                    "original_filename": row["original_filename"],
                     "own_account_masked": master_data.mask_account_number(row["own_account"])
                     if row["own_account"]
                     else None,
+                    "counterparty_account_masked": master_data.mask_account_number(
+                        row["counterparty_account"]
+                    )
+                    if row["counterparty_account"]
+                    else None,
                     "counterparty_name": row["counterparty_name"],
                     "summary": row["summary"],
                     "reference": row["reference"],