migration: preserve startup accounts and system slice

docs/migration/保真迁移状态.json

@@ -1,6 +1,6 @@
 {
   "schema_version": 1,
-  "updated_at": "2026-07-30T23:55:00+08:00",
+  "updated_at": "2026-07-31T00:37:00+08:00",
   "status": "active",
   "migration_mode": "behavior_preserving_source_migration",
   "source_of_truth": "current_original_webapp_runtime_and_source",
@@ -9,13 +9,14 @@
   "failed_roots": [
     "next"
   ],
-  "current_slice": null,
-  "last_completed_slice": "slice-00-exact-runtime-copy",
-  "last_checkpoint": "xiaobai-preservation-migration-charter-20260730",
-  "next_action": "commit_and_push_slice-00_then_begin_startup_http_account_migration",
+  "current_slice": "slice-02-market-search-charts-data",
+  "last_completed_slice": "slice-01-startup-http-accounts-system",
+  "last_checkpoint": "xiaobai-preservation-slice-01-20260731",
+  "next_action": "capture_slice-02_market_search_chart_data_contracts_then_move_original_implementations",
   "authoritative_documents": [
     "AGENTS.md",
     "docs/migration/原版保真迁移总纲.md",
+    "docs/migration/目标目录与切片顺序.md",
     "docs/migration/保真迁移账本.md",
     "docs/migration/next失败冻结记录.md"
   ],