feat: setup S2S integration, tailwind fixes, admin routing, nginx fallback

backend/models/Config.js

@@ -0,0 +1,25 @@
+const mongoose = require('mongoose');
+
+const configSchema = new mongoose.Schema(
+  {
+    keyName: {
+      type: String,
+      required: true,
+      unique: true,
+    },
+    encryptedValue: {
+      type: String,
+      required: true,
+    },
+    iv: {
+      type: String, // Initialization vector needed for decryption
+      required: true,
+    }
+  },
+  {
+    timestamps: true,
+  }
+);
+
+const Config = mongoose.model('Config', configSchema);
+module.exports = Config;