feat(admin): implement unified submission and newsletter management

Introduce a centralized system to manage all website form submissions and newsletter subscriptions.
- Add `Submission` and `NewsletterSubscription` models with MongoDB schema validation
- Implement `submissionController` and `newsletterSubscriptionController` for CRUD operations and filtering
- Create a unified admin UI for reviewing submissions across different sources (home, request, contact, partnership, newsletter)
- Add database migration scripts for creating collections and indexes
- Refactor partnership inquiry forms to use a fixed field structure
- Update admin navigation and server CORS settings to support PATCH requests

views/admin/partnerships/partials/editor-script.ejs

@@ -97,12 +97,6 @@
       renderPartners();
     });
 
-    document.getElementById("addInquiryFieldBtn")?.addEventListener("click", function () {
-      state.inquiryForm.fields.push(getDefaultInquiryField());
-      ensurePartnershipIds();
-      renderInquiryFields();
-    });
-
     document.getElementById("resetPartnershipsForm")?.addEventListener("click", function () {
       window.location.reload();
     });
@@ -378,7 +372,7 @@
         input.value = field[key] || "";
         input.addEventListener("input", function () {
           field[key] = input.value;
-            if (key === "label") {
+          if (key === "label") {
             title.textContent = input.value || `${inquiryFieldFields.label?.label || "Field"} ${index + 1}`;
           }
           if (key === "type") {
@@ -401,11 +395,6 @@
         }
       });
 
-      node.querySelector("[data-remove-item]").addEventListener("click", function () {
-        state.inquiryForm.fields.splice(index, 1);
-        renderInquiryFields();
-      });
-
       node.querySelector("[data-add-option]").addEventListener("click", function () {
         field.options = Array.isArray(field.options) ? field.options : [];
         field.options.push("");
@@ -444,7 +433,6 @@
       inquiryFieldsList.appendChild(node);
     });
 
-    initSortable(inquiryFieldsList, state.inquiryForm.fields, renderInquiryFields, '[data-item="inquiry-field"]');
   }
 
   function initSortable(container, list, rerender, draggableSelector) {

views/admin/partnerships/partials/inquiry-form-tab.ejs

@@ -16,17 +16,13 @@
         <div class="mb-3">
           <div>
             <label class="form-label fw-semibold mb-1"><%= inquiryUi.fields?.label || "Form fields" %></label>
-            <div class="form-text mt-0"><%= inquiryUi.fieldsHelpText || inquiryUi.fields?.helpText || "" %></div>
+            <div class="form-text mt-0">
+              Field structure is fixed to match the inquiry form: First Name, Last Name, Organization Name, Partnership Type, and Message. You can edit field text, required state, width, and Partnership Type select options.
+            </div>
           </div>
         </div>
         <div id="inquiryFieldsList"></div>
-        <button type="button" class="cms-add-button mt-3" id="addInquiryFieldBtn">
-          <i class="fas fa-plus me-2"></i><%= inquiryUi.fields?.addLabel || "Add Field" %>
-        </button>
       </div>
     </div>
   </div>
 </div>
-
-
-

views/admin/partnerships/partials/templates.ejs

@@ -100,9 +100,6 @@
   <div class="card cms-item-card mb-3" data-item="inquiry-field">
     <div class="card-header d-flex justify-content-between align-items-center gap-2 flex-wrap">
       <div class="d-flex align-items-center gap-2">
-        <button type="button" class="drag-handle" title="Drag to reorder">
-          <i class="fas fa-grip-vertical"></i>
-        </button>
         <div>
           <div class="fw-semibold" data-title>Field</div>
           <div class="small text-muted" data-subtitle></div>
@@ -112,9 +109,6 @@
         <button type="button" class="cms-collapse-toggle" data-toggle-item title="Collapse item">
           <i class="fas fa-chevron-down"></i>
         </button>
-        <button type="button" class="cms-remove-button" data-remove-item title="Remove item">
-          <i class="fas fa-trash-alt"></i>
-        </button>
       </div>
     </div>
     <div class="card-body">
@@ -129,7 +123,7 @@
         </div>
         <div class="col-md-4">
           <label class="form-label fw-semibold"><%= inquiryFieldFields.type?.label || "Field type" %></label>
-          <select class="form-select" data-field="type">
+          <select class="form-select" data-field="type" disabled>
             <% (inquiryFieldFields.type?.options || []).forEach((option) => { %>
               <option value="<%= option.value %>"><%= option.label %></option>
             <% }) %>
@@ -144,10 +138,10 @@
           </select>
         </div>
         <div class="col-md-4 d-flex align-items-end">
-          <div class="form-check mb-2">
-            <input class="form-check-input" type="checkbox" data-field="required">
-            <label class="form-check-label fw-semibold"><%= inquiryFieldFields.required?.label || "Required field" %></label>
-          </div>
+            <div class="form-check mb-2">
+              <input class="form-check-input" type="checkbox" data-field="required">
+              <label class="form-check-label fw-semibold"><%= inquiryFieldFields.required?.label || "Required field" %></label>
+            </div>
         </div>
         <div class="col-12" data-options-wrap>
           <div class="cms-editor-group">