feat(admin): configure system navigation defaults

src/govoplan_admin/backend/manifest.py

@@ -142,6 +142,21 @@ manifest = ModuleManifest(
                 ],
             },
         ),
+        DocumentationTopic(
+            id="admin.system-navigation",
+            title="Set the system navigation baseline",
+            summary="System administrators define the instance-wide side-rail order, visibility baseline, and entries that lower scopes must keep visible.",
+            body=(
+                "The system navigation setting starts from module-declared defaults. Tenant settings take precedence over the system order and visibility, and personal settings take precedence over both. A system lock prevents tenant and user preferences from hiding an entry but does not prevent them from moving it. Removing the system preference restores module defaults. Navigation policy changes presentation only: module entitlement, View policy, and permissions still decide whether a surface is accessible."
+            ),
+            documentation_types=("admin",),
+            audience=("system_admin",),
+            related_modules=("tenancy", "access", "views"),
+            metadata={
+                "kind": "reference",
+                "help_contexts": ["admin.system-settings"],
+            },
+        ),
         DocumentationTopic(
             id="admin.module-lifecycle-workflow",
             title="Plan and supervise module lifecycle changes",