build: prettier leaves side-effect imports where they are

The sort-imports plugin moved bare imports along with the rest, which on
src/index.ts would have put reflect-metadata after the modules that need it
and the env validation ahead of dotenv. With importOrderSideEffects off, a
side-effect import stays in place and the imports between two of them are
sorted on their own. The three test files that were already formatted gain
the blank line the new grouping writes after reflect-metadata.

server/.prettierrc

@@ -14,5 +14,6 @@
   "importOrderParserPlugins": [
     "typescript",
     "decorators-legacy"
-  ]
+  ],
+  "importOrderSideEffects": false
 }

server/tests/unit/nest-mcp/discovery.test.ts

@@ -4,6 +4,7 @@ import { Injectable, Module } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
 
 import 'reflect-metadata';
+
 import { afterEach, describe, expect, it } from 'vitest';
 import { z } from 'zod';
 

server/tests/unit/nest-mcp/error-mapper.test.ts

@@ -11,6 +11,7 @@ import { Module } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
 
 import 'reflect-metadata';
+
 import { afterEach, describe, expect, it } from 'vitest';
 import { z } from 'zod';
 

server/tests/unit/nest-mcp/tool-gate.test.ts

@@ -13,6 +13,7 @@ import { Injectable, Module } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
 
 import 'reflect-metadata';
+
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { z } from 'zod';
 

shared/.prettierrc

@@ -14,5 +14,6 @@
   "importOrderParserPlugins": [
     "typescript",
     "decorators-legacy"
-  ]
+  ],
+  "importOrderSideEffects": false
 }