chore(deps): update dependencies and remove unused files

Updated several dependencies including:
- @aws-sdk/client-s3 from 3.965.0 to 3.975.0
- @aws-sdk/client-ses from 3.965.0 to 3.975.0
- @aws-sdk/client-sqs from 3.965.0 to 3.975.0
- dotenv from ^16.6.1 to ^16.5.0
- form-data from ^4.0.2 to ^4.0.5
- typescript from 5.9.3 to 5.8.3

Removed unused files:
- backend/.yarn/releases/yarn-4.9.1.cjs
- backend/package-lock.json

backend/tsconfig.build.json

@@ -1,17 +1,4 @@
 {
   "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "incremental": true,
-    "tsBuildInfoFile": "./dist/.tsbuildinfo",
-    "skipLibCheck": true,
-    "forceConsistentCasingInFileNames": true,
-    "noEmit": false
-  },
-  "exclude": [
-    "node_modules",
-    "test",
-    "**/*.spec.ts",
-    "**/*.test.ts",
-    "**/*.e2e-spec.ts"
-  ]
+  "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
 }