feat: complete MongoDB to CouchDB migration and deployment

- Remove all mongoose dependencies from backend
- Convert Badge and PointTransaction models to CouchDB
- Fix gamificationService for CouchDB architecture
- Update Docker registry URLs to use HTTPS (port 443)
- Fix ingress configuration for HAProxy
- Successfully deploy multi-architecture images
- Application fully running on Kubernetes with CouchDB

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

backend/server.js

@@ -1,6 +1,5 @@
 require("dotenv").config();
 const express = require("express");
-const mongoose = require("mongoose");
 const couchdbService = require("./services/couchdbService");
 const cors = require("cors");
 const http = require("http");
@@ -59,16 +58,7 @@ const apiLimiter = rateLimit({
   legacyHeaders: false,
 });
 
-// Database Connections
-// MongoDB (for backward compatibility during migration)
-mongoose
-  .connect(process.env.MONGO_URI, {
-    useNewUrlParser: true,
-    useUnifiedTopology: true,
-  })
-  .then(() => console.log("MongoDB connected"))
-  .catch((err) => console.log("MongoDB connection error:", err));
-
+// Database Connection
 // CouchDB (primary database)
 couchdbService.initialize()
   .then(() => console.log("CouchDB initialized"))
@@ -134,7 +124,6 @@ app.get("/api/health", async (req, res) => {
       status: "healthy",
       timestamp: new Date().toISOString(),
       uptime: process.uptime(),
-      mongodb: mongoose.connection.readyState === 1 ? "connected" : "disconnected",
       couchdb: couchdbStatus ? "connected" : "disconnected",
     });
   } catch (error) {
@@ -142,7 +131,6 @@ app.get("/api/health", async (req, res) => {
       status: "unhealthy",
       timestamp: new Date().toISOString(),
       uptime: process.uptime(),
-      mongodb: mongoose.connection.readyState === 1 ? "connected" : "disconnected",
       couchdb: "disconnected",
       error: error.message,
     });