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.

scripts/_migrate-singleton-page.js

@@ -0,0 +1,38 @@
+require("dotenv").config();
+const fs = require("fs").promises;
+const path = require("path");
+const connectDB = require("../config/database");
+
+async function migrateSingletonPage({
+  migrationName,
+  modelPath,
+  dataFile,
+  label,
+}) {
+  try {
+    await connectDB();
+    console.log(`🚀 Starting migration: ${migrationName}...`);
+
+    const Model = require(modelPath);
+    console.log(`✅ ${label} model registered successfully`);
+
+    const dataPath = path.join(__dirname, "..", "data", dataFile);
+    const raw = await fs.readFile(dataPath, "utf8");
+    const pageData = JSON.parse(raw);
+    console.log(`📖 ${label} data loaded from: ${dataPath}`);
+
+    await Model.deleteMany({});
+    console.log(`🧹 Existing ${label} documents cleared`);
+
+    const created = await Model.create(pageData);
+    console.log(`✅ ${label} document created with _id: ${created._id.toString()}`);
+
+    console.log(`🎉 Migration ${migrationName} completed successfully.`);
+    process.exit(0);
+  } catch (error) {
+    console.error(`❌ Migration ${migrationName} failed:`, error);
+    process.exit(1);
+  }
+}
+
+module.exports = migrateSingletonPage;