refactor: reorganize environment configurations by replacing global .env with environment-specific files and updating npm scripts accordingly

.env.uat

@@ -0,0 +1,10 @@
+DB_HOST=106.51.105.22
+DB_PORT=5432
+DB_NAME=ar_uat
+DB_USER=ar_user
+DB_PASSWORD="V$:Q1Hc6Qh]@#Fr"
+DB_SYNCHRONIZE=true
+DB_SSL=false
+PORT=9501
+CORS_ORIGIN=https://aruat.maskantech.in
+NODE_ENV=uat

README.md

@@ -18,46 +18,43 @@ This is the backend REST API powered by NestJS.
    npm install
    ```
 
-### Environment files
-The project uses environment-specific files:
-- .env
-- .env.dev
-- .env.test
+### Environment Files
 
-The npm scripts automatically set NODE_ENV so the correct file is used.
+The project uses environment-specific files. The npm scripts automatically set `NODE_ENV` so the correct file is loaded (e.g. `.env.dev`).
+
+- `.env.local`
+- `.env.dev`
+- `.env.uat`
+- `.env.test`
+
+### Running the Application
+
+To start the server, use the command corresponding to your target environment:
 
-### Run locally
-Start the local development server:
 ```bash
-npm run start
-```
+# Local environment
+npm run local
+npm run start:local # (watch mode)
 
-Start the development server in watch mode:
-```bash
+# Development environment
 npm run dev
-```
+npm run start:dev   # (watch mode)
 
-### Run tests
-Run the test suite with the test environment:
-```bash
+# UAT environment
+npm run uat
+npm run start:uat   # (watch mode)
+
+# Test environment
 npm run test
 ```
 
-### Build commands
-Build for development:
-```bash
-npm run build:dev
-```
+### Database Seeding
 
-Build for test:
-```bash
-npm run build:test
-```
+To run the master data seed scripts for a specific environment:
 
-### Useful scripts
-- npm run start - starts the app using the local development environment
-- npm run dev - starts the app using .env.dev
-- npm test - runs tests using .env.test
-- npm run build - builds the app for development
-- npm run build:dev - explicit development build
-- npm run build:test - explicit test build
+```bash
+npm run seed:local
+npm run seed:dev
+npm run seed:uat
+npm run seed:test
+```

package.json

@@ -7,10 +7,17 @@
   "license": "UNLICENSED",
   "scripts": {
     "dev": "cross-env NODE_ENV=dev nest start",
-    "seed": "cross-env NODE_ENV=dev ts-node -r tsconfig-paths/register scripts/seed-master-data.ts",
+    "uat": "cross-env NODE_ENV=uat nest start",
+    "local": "cross-env NODE_ENV=local nest start",
+    "seed:dev": "cross-env NODE_ENV=dev ts-node -r tsconfig-paths/register scripts/seed-master-data.ts",
+    "seed:local": "cross-env NODE_ENV=local ts-node -r tsconfig-paths/register scripts/seed-master-data.ts",
+    "seed:uat": "cross-env NODE_ENV=uat ts-node -r tsconfig-paths/register scripts/seed-master-data.ts",
+    "seed:test": "cross-env NODE_ENV=test ts-node -r tsconfig-paths/register scripts/seed-master-data.ts",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
     "start": "nest start",
     "start:dev": "cross-env NODE_ENV=dev nest start --watch",
+    "start:uat": "cross-env NODE_ENV=uat nest start --watch",
+    "start:local": "cross-env NODE_ENV=local nest start --watch",
     "start:debug": "nest start --debug --watch",
     "start:prod": "node dist/main",
     "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",