docs: document template naming and maintenance refactor

Update agent and LLM guidance to reference the architecture strategy and
add a template naming rule that keeps reusable abstractions domain-neutral.

Mark maintenance Phase 3 as complete and document the page driver/page
component refactors for EditableGrid and MasterDetail variants.docs: document template naming and maintenance refactor

Update agent and LLM guidance to reference the architecture strategy and
add a template naming rule that keeps reusable abstractions domain-neutral.

Mark maintenance Phase 3 as complete and document the page driver/page
component refactors for EditableGrid and MasterDetail variants.

src/composables/page-drivers/useMasterDetailCMaintenancePage.ts

@@ -0,0 +1,20 @@
+import { computed } from 'vue'
+
+import type { MaintenancePageModel } from '@/models/page'
+import { useStudentStore } from '@/stores/students'
+
+export function useMasterDetailCMaintenancePage() {
+  const studentStore = useStudentStore()
+
+  const pageModel = computed<MaintenancePageModel>(() => ({
+    type: 'maintenance',
+    title: '主從資料維護示範C',
+    records: studentStore.students,
+    loading: false,
+    error: null,
+  }))
+
+  return {
+    pageModel,
+  }
+}