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

controllers/partnershipsController.js

@@ -4,6 +4,14 @@ const partnershipsConfig = require("../utils/contentEditors/partnershipsConfig")
 const createPageContentController = require("./_createPageContentController");
 const { ensureUniqueIds } = require("../utils/contentEditorIds");
 
+const FIXED_INQUIRY_FIELDS = [
+  { id: "firstName", type: "text", width: "half", label: "First name", placeholder: "First name", required: true },
+  { id: "lastName", type: "text", width: "half", label: "Last name", placeholder: "Last name", required: true },
+  { id: "organization", type: "text", width: "full", label: "Organization name", placeholder: "Company or Institution", required: true },
+  { id: "partnershipType", type: "select", width: "full", label: "Partnership type", placeholder: "Select partnership type", required: true },
+  { id: "message", type: "textarea", width: "full", label: "Message", placeholder: "Tell us how you'd like to collaborate...", required: true },
+];
+
 function getTabConfig(tabKey) {
   return (partnershipsConfig.tabs || []).find((tab) => tab.key === tabKey) || {};
 }
@@ -85,7 +93,25 @@ function normalizeInquiryForm(data) {
   }
 
   if (Array.isArray(data.inquiryForm.fields)) {
-    return data;
+    const fieldsById = new Map(data.inquiryForm.fields.map((field) => [field.id, field]));
+    return {
+      ...data,
+      inquiryForm: {
+        ...data.inquiryForm,
+        fields: FIXED_INQUIRY_FIELDS.map((fixedField) => {
+          const field = fieldsById.get(fixedField.id) || {};
+          return {
+            id: fixedField.id,
+            label: field.label || fixedField.label,
+            placeholder: field.placeholder || fixedField.placeholder,
+            type: fixedField.type,
+            width: ["half", "full"].includes(field.width) ? field.width : fixedField.width,
+            required: field.required === undefined ? fixedField.required : Boolean(field.required),
+            options: Array.isArray(field.options) ? field.options.filter(Boolean) : [],
+          };
+        }),
+      },
+    };
   }
 
   const legacyFields = data.inquiryForm.fields || {};
@@ -110,7 +136,7 @@ function normalizeInquiryForm(data) {
   };
 }
 
-function prepareInquiryPayload(payload) {
+function prepareInquiryPayload(payload, context = {}) {
   const normalized = normalizeInquiryForm(payload);
   const fields = Array.isArray(normalized?.inquiryForm?.fields)
     ? normalized.inquiryForm.fields
@@ -144,6 +170,14 @@ function prepareInquiryPayload(payload) {
     );
   }
 
+  const fieldsById = new Map(fields.map((field) => [field.id, field]));
+  const beforeData = context.beforeData || {};
+  const beforeNormalized = normalizeInquiryForm(beforeData || {});
+  const beforeFields = Array.isArray(beforeNormalized?.inquiryForm?.fields)
+    ? beforeNormalized.inquiryForm.fields
+    : [];
+  const beforeFieldsById = new Map(beforeFields.map((field) => [field.id, field]));
+
   return {
     ...normalized,
     directory: {
@@ -157,20 +191,18 @@ function prepareInquiryPayload(payload) {
     },
     inquiryForm: {
       ...normalized.inquiryForm,
-      fields: ensureUniqueIds(
-        fields,
-        (field) => field.id,
-        (field, index) => field.label || field.placeholder || `field-${index + 1}`,
-        "field",
-      ).map((field) => ({
-        id: field.id,
-        label: field.label || "",
-        placeholder: field.placeholder || "",
-        type: field.type || "text",
-        width: field.width || "full",
-        required: Boolean(field.required),
-        options: Array.isArray(field.options) ? field.options.filter(Boolean) : [],
-      })),
+      fields: FIXED_INQUIRY_FIELDS.map((fixedField) => {
+        const field = fieldsById.get(fixedField.id) || beforeFieldsById.get(fixedField.id) || {};
+        return {
+          id: fixedField.id,
+          label: field.label || fixedField.label,
+          placeholder: field.placeholder || fixedField.placeholder,
+          type: fixedField.type,
+          width: ["half", "full"].includes(field.width) ? field.width : fixedField.width,
+          required: field.required === undefined ? fixedField.required : Boolean(field.required),
+          options: Array.isArray(field.options) ? field.options.filter(Boolean) : [],
+        };
+      }),
     },
   };
 }
@@ -195,6 +227,9 @@ controller.index = async function index(req, res) {
       process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
     const defaultTab = partnershipsConfig.tabs[0]?.key;
     const requestedTab = req.query.tab;
+    if (requestedTab === "submissions") {
+      return res.redirect("/admin/submissions?tab=partnership");
+    }
     const activeTab = partnershipsConfig.tabs.some((tab) => tab.key === requestedTab)
       ? requestedTab
       : defaultTab;