refactor(server): rename PORT to NODE_PORT (#10193)

Updated the environment variable name from PORT to NODE_PORT for more
clarity and alignment with node server conventions. Adjusted references
in configuration and application bootstrap accordingly.

Fix #10017

packages/twenty-server/src/engine/core-modules/environment/environment-variables.ts

@@ -747,12 +747,12 @@ export class EnvironmentVariables {
 
   @EnvironmentVariablesMetadata({
     group: EnvironmentVariablesGroup.ServerConfig,
-    description: 'Port for the backend server',
+    description: 'Port for the node server',
   })
   @CastToPositiveNumber()
   @IsNumber()
   @IsOptional()
-  PORT = 3000;
+  NODE_PORT = 3000;
 
   @EnvironmentVariablesMetadata({
     group: EnvironmentVariablesGroup.ServerConfig,