refactor(backend): add status constants and update code to use them

- Create constants/statuses.js with MATCH_STATUS, SUGGESTION_STATUS
- Update routes/dashboard.js to use MATCH_STATUS
- Update routes/matches.js to use MATCH_STATUS
- Update routes/events.js to use SUGGESTION_STATUS
- Update services/matching.js to use SUGGESTION_STATUS
- Update tests to use constants

backend/src/routes/dashboard.js

@@ -8,6 +8,7 @@ const router = express.Router();
 const { authenticate } = require('../middleware/auth');
 const { PrismaClient } = require('@prisma/client');
 const { getEventsOnlineCounts } = require('../socket');
+const { MATCH_STATUS } = require('../constants');
 
 const prisma = new PrismaClient();
 
@@ -101,7 +102,7 @@ router.get('/', authenticate, async (req, res, next) => {
           { user1Id: userId },
           { user2Id: userId },
         ],
-        status: 'accepted',
+        status: MATCH_STATUS.ACCEPTED,
       },
       include: {
         user1: {
@@ -219,7 +220,7 @@ router.get('/', authenticate, async (req, res, next) => {
     const incomingRequests = await prisma.match.findMany({
       where: {
         user2Id: userId,
-        status: 'pending',
+        status: MATCH_STATUS.PENDING,
       },
       include: {
         user1: {
@@ -298,7 +299,7 @@ router.get('/', authenticate, async (req, res, next) => {
     const outgoingRequests = await prisma.match.findMany({
       where: {
         user1Id: userId,
-        status: 'pending',
+        status: MATCH_STATUS.PENDING,
       },
       include: {
         user2: {