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.

views/admin/partnerships/partials/cta-tab.ejs

@@ -0,0 +1,26 @@
+<div class="tab-pane fade <%= activeTab === 'cta' ? 'show active' : '' %>" id="cta" role="tabpanel">
+  <div class="card border shadow-sm">
+    <div class="card-header bg-white">
+      <h6 class="mb-0"><i class="fas fa-bullhorn me-2"></i>Call To Action</h6>
+    </div>
+    <div class="card-body p-4">
+      <div class="row g-3">
+        <div class="col-12">
+          <label class="form-label fw-semibold">Headline</label>
+          <input class="form-control" id="ctaHeading" maxlength="80" value="<%= data.cta?.heading || '' %>">
+        </div>
+        <div class="col-12">
+          <label class="form-label fw-semibold">Supporting text</label>
+          <textarea class="form-control" id="ctaDescription" rows="4" maxlength="220"><%= data.cta?.description || '' %></textarea>
+        </div>
+        <div class="col-md-6">
+          <label class="form-label fw-semibold">Button label</label>
+          <input class="form-control" id="ctaButtonLabel" maxlength="40" value="<%= data.cta?.buttonLabel || '' %>">
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
+
+
+