feat(cms): refactor page content management and implement detailed editors

Refactor the CMS page content system to use a more modular configuration-driven approach. This replaces the monolithic `pageContentConfig.js` with individual configuration files for each page and introduces a shared field utility to standardize editor components.
Key changes:
- Implement a generic `_renderSingletonPageView` helper to reduce duplication across controllers.
- Enhance `_createPageContentController` with `normalizeForEditor`, `normalizeForApi`, and `preparePayload` hooks for custom data transformation.
- Create dedicated configuration and view structures for Partnerships, History, Accreditation, Admissions, and Policies pages.
- Add a specialized section editor for Policies to manage complex nested content.
- Improve the frontend `page-content-editor.js` with support for visibility logic, auto-sequencing for arrays, and URL synchronization for active tabs.
- Update data JSON files to align with the new schema.

controllers/_createPageContentController.js

@@ -8,12 +8,16 @@ function createPageContentController({
   modelName,
   auditAction,
   editorConfig,
+  normalizeForEditor,
+  normalizeForApi,
+  preparePayload,
 }) {
   return {
     async index(req, res) {
       try {
         const doc = await model.getSingle();
-        const data = doc.toObject();
+        const rawData = doc.toObject();
+        const data = normalizeForEditor ? normalizeForEditor(rawData, req) : rawData;
         const frontendUrl = process.env.FRONTEND_URL || "http://localhost:3000";
         const backendUrl =
           process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
@@ -40,7 +44,7 @@ function createPageContentController({
 
     async update(req, res) {
       try {
-        const payload =
+        const rawPayload =
           typeof req.body.pageJson === "string"
             ? JSON.parse(req.body.pageJson)
             : req.body.pageJson || {};
@@ -48,6 +52,9 @@ function createPageContentController({
         const activeTab = req.body.activeTab || editorConfig.tabs[0].key;
         const doc = await model.getSingle();
         const beforeData = JSON.parse(JSON.stringify(doc.toObject()));
+        const payload = preparePayload
+          ? preparePayload(rawPayload, { req, doc, beforeData })
+          : rawPayload;
 
         doc.set(payload);
         Object.keys(payload).forEach((key) => doc.markModified(key));
@@ -98,7 +105,8 @@ function createPageContentController({
         const rawData = doc.toObject();
         const backendUrl =
           process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
-        const processed = addBaseUrlToImages(rawData, backendUrl);
+        const normalized = normalizeForApi ? normalizeForApi(rawData, req) : rawData;
+        const processed = addBaseUrlToImages(normalized, backendUrl);
         return res.json(processed);
       } catch (error) {
         console.error(`${editorConfig.key} api error:`, error);