feat(cms): add management for partnerships, history, accreditation, admissions, and policies pages

Implement a singleton page content system to manage static informational pages. This includes:
- New controllers, models, and data files for Partnerships, History, Accreditation, Admissions, and Policies.
- Admin routes and views for updating page content.
- Public API endpoints for fetching page data.
- Migration scripts for initializing page data.
- Updated admin navigation layout to include a dropdown for "About" sections.
- Audit action constants for tracking updates to these pages.

controllers/_createPageContentController.js

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+const { addBaseUrlToImages } = require("../utils/imageHelper");
+const jsonHelper = require("../utils/jsonHelper");
+const writeAuditLog = require("../audit/writeAuditLog");
+const diffObject = require("../audit/diffObject");
+
+function createPageContentController({
+  model,
+  modelName,
+  auditAction,
+  editorConfig,
+}) {
+  return {
+    async index(req, res) {
+      try {
+        const doc = await model.getSingle();
+        const data = doc.toObject();
+        const frontendUrl = process.env.FRONTEND_URL || "http://localhost:3000";
+        const backendUrl =
+          process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
+
+        res.render("admin/pageContent/index", {
+          layout: "layouts/main",
+          title: editorConfig.title,
+          subtitle: editorConfig.subtitle,
+          data,
+          editorConfig,
+          activeTab: req.query.tab || editorConfig.tabs[0].key,
+          frontendUrl,
+          backendUrl,
+          previewUrl: `${frontendUrl}${editorConfig.previewPath}`,
+          currentPath: req.path,
+          user: req.session.user,
+        });
+      } catch (error) {
+        console.error(`${editorConfig.key} index error:`, error);
+        req.flash("error_msg", `Error loading ${editorConfig.title}`);
+        return req.session.save(() => res.redirect("/admin/dashboard"));
+      }
+    },
+
+    async update(req, res) {
+      try {
+        const payload =
+          typeof req.body.pageJson === "string"
+            ? JSON.parse(req.body.pageJson)
+            : req.body.pageJson || {};
+
+        const activeTab = req.body.activeTab || editorConfig.tabs[0].key;
+        const doc = await model.getSingle();
+        const beforeData = JSON.parse(JSON.stringify(doc.toObject()));
+
+        doc.set(payload);
+        Object.keys(payload).forEach((key) => doc.markModified(key));
+        await doc.save();
+
+        const afterData = JSON.parse(JSON.stringify(doc.toObject()));
+        const changes = diffObject(beforeData, afterData);
+
+        if (changes.length > 0) {
+          await writeAuditLog({
+            model: modelName,
+            documentId: doc._id,
+            action: auditAction,
+            before: beforeData,
+            after: afterData,
+            changes,
+            req,
+          });
+        }
+
+        const finalData = await model
+          .findOne()
+          .select("-_id -__v -createdAt -updatedAt")
+          .lean();
+        jsonHelper.writeJsonFile(editorConfig.dataFile, finalData);
+
+        req.flash("success_msg", `${editorConfig.title} updated successfully`);
+        return req.session.save(() =>
+          res.redirect(`${editorConfig.routeBase}?tab=${activeTab}`),
+        );
+      } catch (error) {
+        console.error(`${editorConfig.key} update error:`, error);
+        req.flash(
+          "error_msg",
+          `Error updating ${editorConfig.title}: ${error.message}`,
+        );
+        return req.session.save(() =>
+          res.redirect(
+            `${editorConfig.routeBase}?tab=${req.body.activeTab || ""}`,
+          ),
+        );
+      }
+    },
+
+    async api(req, res) {
+      try {
+        const doc = await model.getSingle();
+        const rawData = doc.toObject();
+        const backendUrl =
+          process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
+        const processed = addBaseUrlToImages(rawData, backendUrl);
+        return res.json(processed);
+      } catch (error) {
+        console.error(`${editorConfig.key} api error:`, error);
+        return res
+          .status(500)
+          .json({ error: `Error loading ${editorConfig.key} data` });
+      }
+    },
+  };
+}
+
+module.exports = createPageContentController;

controllers/accreditationController.js

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+const AccreditationPage = require("../models/accreditationPage");
+const AUDIT_ACTIONS = require("../constants/auditAction");
+const pageContentConfig = require("../utils/pageContentConfig");
+const createPageContentController = require("./_createPageContentController");
+
+module.exports = createPageContentController({
+  model: AccreditationPage,
+  modelName: "AccreditationPage",
+  auditAction: AUDIT_ACTIONS.UPDATE_ACCREDITATION,
+  editorConfig: pageContentConfig.accreditation,
+});

controllers/admissionsController.js

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+const AdmissionsPage = require("../models/admissionsPage");
+const AUDIT_ACTIONS = require("../constants/auditAction");
+const pageContentConfig = require("../utils/pageContentConfig");
+const createPageContentController = require("./_createPageContentController");
+
+module.exports = createPageContentController({
+  model: AdmissionsPage,
+  modelName: "AdmissionsPage",
+  auditAction: AUDIT_ACTIONS.UPDATE_ADMISSIONS,
+  editorConfig: pageContentConfig.admissions,
+});

controllers/historyPageController.js

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+const HistoryPage = require("../models/historyPage");
+const AUDIT_ACTIONS = require("../constants/auditAction");
+const pageContentConfig = require("../utils/pageContentConfig");
+const createPageContentController = require("./_createPageContentController");
+
+module.exports = createPageContentController({
+  model: HistoryPage,
+  modelName: "HistoryPage",
+  auditAction: AUDIT_ACTIONS.UPDATE_HISTORY,
+  editorConfig: pageContentConfig.history,
+});

controllers/partnershipsController.js

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+const PartnershipsPage = require("../models/partnerships");
+const AUDIT_ACTIONS = require("../constants/auditAction");
+const pageContentConfig = require("../utils/pageContentConfig");
+const createPageContentController = require("./_createPageContentController");
+
+module.exports = createPageContentController({
+  model: PartnershipsPage,
+  modelName: "PartnershipsPage",
+  auditAction: AUDIT_ACTIONS.UPDATE_PARTNERSHIPS,
+  editorConfig: pageContentConfig.partnerships,
+});

controllers/policiesController.js

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+const PoliciesPage = require("../models/policiesPage");
+const AUDIT_ACTIONS = require("../constants/auditAction");
+const pageContentConfig = require("../utils/pageContentConfig");
+const createPageContentController = require("./_createPageContentController");
+
+module.exports = createPageContentController({
+  model: PoliciesPage,
+  modelName: "PoliciesPage",
+  auditAction: AUDIT_ACTIONS.UPDATE_POLICIES,
+  editorConfig: pageContentConfig.policies,
+});