diff --git a/MEMORY.md b/MEMORY.md
index 7faab40..1aca1d4 100644
--- a/MEMORY.md
+++ b/MEMORY.md
@@ -719,6 +719,8 @@
   - admin 默认授予上述权限。
 - 菜单口径：
   - 新增菜单 `admin.power_lines`，路由 `/admin/power-lines`；
+  - 一级菜单默认排序中，`admin.power_lines` 使用最小 `sort_order`，应展示在后台菜单最前面；
+  - 后台默认菜单集合补齐 `admin.fl_analysis`、`admin.fault_recurrence`、`admin.basic_data`、`admin.system_monitor`、`admin.system`；其中后 3 项为无路由目录菜单，用于保留现存菜单树全量可见性。
   - 页面由 `web/src/app/admin/power-lines/page.tsx` 承载线路与杆塔管理闭环。
 
 ## 线路地图展示口径（2026-04-25）
diff --git a/api/app/services/admin_service.py b/api/app/services/admin_service.py
index c8e23fc..a6afbd5 100644
--- a/api/app/services/admin_service.py
+++ b/api/app/services/admin_service.py
@@ -404,7 +404,28 @@ def update_menu(db: Session, menu_id: int, payload: MenuUpdateRequest) -> MenuPu
 
 def delete_menu(db: Session, menu_id: int) -> bool:
     menu = get_menu_by_id(db, menu_id)
-    if not menu or menu.code in {"admin.users", "admin.roles", "admin.menus", "admin.system_params", "admin.power_lines", "admin.lightning_currents", "admin.lightning_distribution", "admin.workers", "admin.task_monitor", "admin.atp_models", "admin.tower_models", "admin.files", "admin.elevation", "admin.syslog", "admin.wine_runner"}:
+    if not menu or menu.code in {
+        "admin.users",
+        "admin.roles",
+        "admin.menus",
+        "admin.system_params",
+        "admin.system",
+        "admin.system_monitor",
+        "admin.basic_data",
+        "admin.power_lines",
+        "admin.fl_analysis",
+        "admin.fault_recurrence",
+        "admin.lightning_currents",
+        "admin.lightning_distribution",
+        "admin.workers",
+        "admin.task_monitor",
+        "admin.atp_models",
+        "admin.tower_models",
+        "admin.files",
+        "admin.elevation",
+        "admin.syslog",
+        "admin.wine_runner",
+    }:
         return False
     child_exists = db.scalar(select(Menu.id).where(Menu.parent_id == menu_id))
     if child_exists is not None:
diff --git a/api/app/services/legacy_admin_rbac_service.py b/api/app/services/legacy_admin_rbac_service.py
index 5d7c7e3..c242e79 100644
--- a/api/app/services/legacy_admin_rbac_service.py
+++ b/api/app/services/legacy_admin_rbac_service.py
@@ -67,13 +67,17 @@ PROTECTED_MENU_CODES = {
     "admin.roles",
     "admin.menus",
     "admin.system_params",
+    "admin.system",
+    "admin.system_monitor",
     "admin.wxapp",
+    "admin.basic_data",
     "admin.files",
     "admin.elevation",
     "admin.tower_models",
     "admin.filedetector",
     "admin.baidu_pan",
     "admin.power_lines",
+    "admin.fl_analysis",
     "admin.fault_recurrence",
     "admin.lightning_currents",
     "admin.lightning_distribution",
diff --git a/api/app/services/legacy_authz_service.py b/api/app/services/legacy_authz_service.py
index 94adde4..5783b4f 100644
--- a/api/app/services/legacy_authz_service.py
+++ b/api/app/services/legacy_authz_service.py
@@ -92,6 +92,7 @@ MENU_CODE_PERMISSION_MAP: dict[str, set[str]] = {
     "admin.roles": {"role.read", "role.manage"},
     "admin.menus": {"menu.read", "menu.manage"},
     "admin.system_params": {"system_param.read", "system_param.manage"},
+    "admin.fl_analysis": {"line.read", "line.manage"},
     "admin.files": {"file.read", "file.manage"},
     "admin.elevation": {"elevation.read", "elevation.manage"},
     "admin.tower_models": {"tower_model.read", "tower_model.manage"},
diff --git a/api/app/services/seed_service.py b/api/app/services/seed_service.py
index b080509..f864206 100644
--- a/api/app/services/seed_service.py
+++ b/api/app/services/seed_service.py
@@ -216,7 +216,7 @@ DEFAULT_MENUS: list[dict[str, object]] = [
         "icon": "Network",
         "parent_code": None,
         "type": "menu",
-        "sort_order": 50,
+        "sort_order": 0,
         "status": "enabled",
         "visible": True,
         "cacheable": False,
@@ -378,10 +378,70 @@ DEFAULT_MENUS: list[dict[str, object]] = [
         "cacheable": False,
         "permission_code": "wine.read",
     },
+    {
+        "code": "admin.basic_data",
+        "name": "基础数据",
+        "path": None,
+        "icon": "Database",
+        "parent_code": None,
+        "type": "directory",
+        "sort_order": 97,
+        "status": "enabled",
+        "visible": True,
+        "cacheable": False,
+        "permission_code": None,
+    },
+    {
+        "code": "admin.system_monitor",
+        "name": "系统监控",
+        "path": None,
+        "icon": "Activity",
+        "parent_code": None,
+        "type": "directory",
+        "sort_order": 98,
+        "status": "enabled",
+        "visible": True,
+        "cacheable": False,
+        "permission_code": None,
+    },
+    {
+        "code": "admin.system",
+        "name": "系统管理",
+        "path": None,
+        "icon": "Settings2",
+        "parent_code": None,
+        "type": "directory",
+        "sort_order": 99,
+        "status": "enabled",
+        "visible": True,
+        "cacheable": False,
+        "permission_code": None,
+    },
 ]
 
 ROLE_MENU_BINDINGS: dict[str, list[str]] = {
-    "admin": ["admin.users", "admin.roles", "admin.menus", "admin.system_params", "admin.power_lines", "admin.fl_analysis", "admin.fault_recurrence", "admin.lightning_currents", "admin.lightning_distribution", "admin.workers", "admin.task_monitor", "admin.atp_models", "admin.tower_models", "admin.files", "admin.elevation", "admin.syslog", "admin.wine_runner"],
+    "admin": [
+        "admin.users",
+        "admin.roles",
+        "admin.menus",
+        "admin.system_params",
+        "admin.power_lines",
+        "admin.fl_analysis",
+        "admin.fault_recurrence",
+        "admin.lightning_currents",
+        "admin.lightning_distribution",
+        "admin.workers",
+        "admin.task_monitor",
+        "admin.atp_models",
+        "admin.tower_models",
+        "admin.files",
+        "admin.elevation",
+        "admin.syslog",
+        "admin.wine_runner",
+        "admin.basic_data",
+        "admin.system_monitor",
+        "admin.system",
+    ],
     "user": [],
 }
 
diff --git a/memory/2026-06-08.md b/memory/2026-06-08.md
new file mode 100644
index 0000000..985c3b6
--- /dev/null
+++ b/memory/2026-06-08.md
@@ -0,0 +1,45 @@
+## Work Log - 当前环境将线路管理菜单置顶（2026-06-08）
+
+- 背景：
+  - 仓库代码已支持 `admin.power_lines` 菜单，但默认排序仍落在其他后台一级菜单之后。
+  - 用户要求在当前环境中让“线路管理”展示在后台菜单最前面。
+
+- 本次处理：
+  - 当前环境数据库：
+    - 将 `menus.code='admin.power_lines'` 的 `sort_order` 调整为 `0`。
+  - 仓库代码：
+    - `api/app/services/seed_service.py`
+      - 将默认种子菜单中 `admin.power_lines` 的 `sort_order` 同步改为 `0`，避免后续补种回退。
+    - `MEMORY.md`
+      - 补充“线路管理默认置顶”的长期口径。
+
+- 验证：
+  - 复核后台菜单排序后，`线路管理` 已位于一级菜单首位。
+
+- 风险与关注点：
+  - 已登录后台的浏览器会话需要刷新页面后才会看到最新菜单顺序。
+
+## Work Log - 放出后台剩余目录菜单并补齐保护（2026-06-08）
+
+- 背景：
+  - 当前仓库默认菜单集合缺少 `admin.basic_data`、`admin.system_monitor`、`admin.system` 3 个目录菜单。
+  - `admin.fl_analysis` 已有完整页面，但旧权限映射与菜单保护集合仍未完全覆盖。
+
+- 本次处理：
+  - `api/app/services/seed_service.py`
+    - 补齐上述 3 个目录菜单，并将其加入 `admin` 默认菜单绑定。
+  - `api/app/services/admin_service.py`
+    - 将 `admin.system`、`admin.system_monitor`、`admin.basic_data`、`admin.fl_analysis`、`admin.fault_recurrence` 加入现代菜单删除保护集合。
+  - `api/app/services/legacy_admin_rbac_service.py`
+    - 将 `admin.system`、`admin.system_monitor`、`admin.basic_data`、`admin.fl_analysis` 加入 legacy 受保护菜单集合。
+  - `api/app/services/legacy_authz_service.py`
+    - 补齐 `admin.fl_analysis` 的 legacy 权限映射。
+
+- 验证：
+  - `git diff --check` 通过。
+  - `npm --workspace web exec tsc --noEmit` 通过。
+  - `npm --workspace web exec eslint src/app/admin/fl-analysis/page.tsx src/app/admin/fault-recurrence/page.tsx` 通过。
+  - Python 变更文件 AST 语法解析通过。
+
+- 风险与关注点：
+  - `admin.basic_data`、`admin.system_monitor`、`admin.system` 仍为无 `path` 的目录菜单，只承担菜单树占位与分组作用。