chore: update @nestjs-modules/mailer and @css-inline dependencies

- Upgrade @nestjs-modules/mailer from version 1.6.1 to 2.0.2 for improved functionality.
- Update @css-inline/css-inline and related packages to version 0.14.1, enhancing compatibility and features across various platforms.
- Refactor package.json and package-lock.json for consistency in dependency management.

package.json

@@ -38,7 +38,7 @@
     "@graphql-codegen/typescript-operations": "^4.2.3",
     "@graphql-codegen/typescript-resolvers": "^4.2.1",
     "@livekit/rtc-node": "^0.11.0",
-    "@nestjs-modules/mailer": "^1.6.1",
+    "@nestjs-modules/mailer": "^2.0.2",
     "@nestjs/apollo": "^12.2.0",
     "@nestjs/axios": "^3.1.1",
     "@nestjs/common": "^10.0.0",
@@ -144,19 +144,13 @@
     "ws": "^8.18.0"
   },
   "jest": {
-    "moduleFileExtensions": [
-      "js",
-      "json",
-      "ts"
-    ],
+    "moduleFileExtensions": ["js", "json", "ts"],
     "rootDir": "src",
     "testRegex": ".*\\.spec\\.ts$",
     "transform": {
       "^.+\\.(t|j)s$": "ts-jest"
     },
-    "collectCoverageFrom": [
-      "**/*.(t|j)s"
-    ],
+    "collectCoverageFrom": ["**/*.(t|j)s"],
     "coverageDirectory": "../coverage",
     "testEnvironment": "node"
   },