[!] Replace S3 setup with Multer setup

Author: YoYo178

backend/.gitignore

@@ -7,4 +7,6 @@ config.js
 # Ignore env files
 config/*.env.*
 
-!config/.env.example
+!config/.env.example
+
+assets

backend/package.json

@@ -24,64 +24,65 @@
     "node": ">=20.6.0"
   },
   "dependencies": {
-    "@aws-sdk/client-s3": "^3.953.0",
-    "@aws-sdk/s3-request-presigner": "^3.953.0",
     "bcrypt": "^6.0.0",
     "cookie-parser": "^1.4.7",
-    "cors": "^2.8.5",
+    "cors": "^2.8.6",
     "dayjs": "^1.11.19",
     "express": "^5.2.1",
     "express-async-handler": "^1.2.0",
     "express-rate-limit": "^8.2.1",
     "helmet": "^8.1.0",
     "inserturlparams": "^2.0.5",
-    "jet-env": "^1.1.4",
-    "jet-logger": "^2.1.1",
+    "jet-env": "^1.1.6",
+    "jet-logger": "^2.2.3",
     "jet-paths": "^2.0.1",
     "jet-schema": "^1.4.3",
-    "jet-validators": "^1.6.5",
+    "jet-validators": "^2.2.6",
     "jsonfile": "^6.2.0",
     "jsonwebtoken": "^9.0.3",
     "module-alias": "^2.2.3",
-    "mongoose": "^9.0.1",
+    "mongoose": "^9.1.5",
     "morgan": "^1.10.1",
-    "nodemailer": "^7.0.11",
-    "validator": "^13.15.23"
+    "multer": "^2.0.2",
+    "nodemailer": "^7.0.12",
+    "uuid": "^13.0.0",
+    "validator": "^13.15.26"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.2",
-    "@stylistic/eslint-plugin": "^5.6.1",
-    "@swc/core": "1.15.5",
+    "@stylistic/eslint-plugin": "^5.7.1",
+    "@swc/core": "1.15.10",
     "@types/bcrypt": "^6.0.0",
     "@types/cookie-parser": "^1.4.10",
     "@types/cors": "^2.8.19",
     "@types/express": "^5.0.6",
     "@types/find": "^0.2.4",
     "@types/fs-extra": "^11.0.4",
-    "@types/jasmine": "^5.1.13",
+    "@types/jasmine": "^6.0.0",
     "@types/jsonfile": "^6.1.4",
     "@types/jsonwebtoken": "^9.0.10",
     "@types/module-alias": "^2.0.4",
     "@types/morgan": "^1.9.10",
-    "@types/node": "^25.0.3",
-    "@types/nodemailer": "^7.0.4",
+    "@types/multer": "^2.0.0",
+    "@types/node": "^25.0.10",
+    "@types/nodemailer": "^7.0.5",
     "@types/supertest": "^6.0.3",
     "@types/validator": "^13.15.10",
     "cross-env": "^10.1.0",
     "eslint": "^9.39.2",
-    "eslint-plugin-n": "^17.23.1",
+    "eslint-plugin-n": "^17.23.2",
     "find": "^0.3.0",
-    "fs-extra": "^11.3.2",
-    "jasmine": "^5.13.0",
+    "fs-extra": "^11.3.3",
+    "jasmine": "^6.0.0",
     "jiti": "^2.6.1",
     "nodemon": "^3.1.11",
-    "supertest": "^7.1.4",
+    "supertest": "^7.2.2",
     "ts-node": "^10.9.2",
     "tsconfig-paths": "^4.2.0",
     "typescript": "^5.9.3",
-    "typescript-eslint": "^8.50.0"
+    "typescript-eslint": "^8.53.1"
   },
-  "packageManager": "pnpm@10.26.0+sha512.3b3f6c725ebe712506c0ab1ad4133cf86b1f4b687effce62a9b38b4d72e3954242e643190fc51fa1642949c735f403debd44f5cb0edd657abe63a8b6a7e1e402",
+  "packageManager": "pnpm@10.28.1+sha512.7d7dbbca9e99447b7c3bf7a73286afaaf6be99251eb9498baefa7d406892f67b879adb3a1d7e687fc4ccc1a388c7175fbaae567a26ab44d1067b54fcb0d6a316",
   "_moduleAliases": {
     "@src": "dist"
   }