feat(router): implement file_tool excel actions on NODE1 stack

docs/runbooks/NODE1_FILE_TOOL_SYNC_RUNBOOK.md

@@ -48,6 +48,8 @@ Critical files were drifted against NODE1 runtime (15 files):
 Implemented in actual NODE1 stack (`services/router/*` + gateway):
 
 ### Added actions
+- `excel_create`
+- `excel_update`
 - `csv_create`
 - `csv_update`
 - `json_export`
@@ -90,6 +92,7 @@ For file-producing tool calls, router now propagates:
 
 ## Smoke Tests
 Run inside `dagi-router-node1` to validate actions deterministically:
+- Excel create/update
 - CSV create/update
 - JSON/YAML export
 - ZIP bundle
@@ -104,6 +107,7 @@ Also verify infer endpoint still works:
 - `rollback_backups/file_tool_step2_tool_manager.py.bak_20260215_012029`
 - `rollback_backups/file_tool_step3_tool_manager.py.bak_20260215_012200`
 - `rollback_backups/file_tool_step4_tool_manager.py.bak_20260215_012309`
+- `services/router/tool_manager.py.bak_20260215_020902`
 
 ## Rollback (NODE1)
 ```bash