chore: [env] .env.example 업데이트 및 .gitignore 정리

- .env.example을 SAM 프로젝트 실제 키 구조로 업데이트
- .gitignore에 !.env.example 예외 추가
- GCS_* 중복 키 제거, Gemini/Claude/Vertex 키 섹션 추가

app/Http/Controllers/Api/V1/BarobillController.php

@@ -1,73 +0,0 @@
-<?php
-
-namespace App\Http\Controllers\Api\V1;
-
-use App\Helpers\ApiResponse;
-use App\Http\Controllers\Controller;
-use App\Http\Requests\Barobill\BankServiceUrlRequest;
-use App\Http\Requests\Barobill\BarobillLoginRequest;
-use App\Http\Requests\Barobill\BarobillSignupRequest;
-use App\Services\Barobill\BarobillSoapService;
-
-class BarobillController extends Controller
-{
-    public function __construct(
-        private BarobillSoapService $barobillSoapService
-    ) {}
-
-    public function login(BarobillLoginRequest $request)
-    {
-        return ApiResponse::handle(
-            fn () => $this->barobillSoapService->registerLogin($request->validated()),
-            __('message.barobill.login_success')
-        );
-    }
-
-    public function signup(BarobillSignupRequest $request)
-    {
-        return ApiResponse::handle(
-            fn () => $this->barobillSoapService->registerSignup($request->validated()),
-            __('message.barobill.signup_success')
-        );
-    }
-
-    public function bankServiceUrl(BankServiceUrlRequest $request)
-    {
-        return ApiResponse::handle(
-            fn () => $this->barobillSoapService->getBankServiceRedirectUrl($request->validated()),
-            __('message.fetched')
-        );
-    }
-
-    public function status()
-    {
-        return ApiResponse::handle(
-            fn () => $this->barobillSoapService->getIntegrationStatus(),
-            __('message.fetched')
-        );
-    }
-
-    public function accountLinkUrl()
-    {
-        return ApiResponse::handle(
-            fn () => $this->barobillSoapService->getAccountLinkRedirectUrl(),
-            __('message.fetched')
-        );
-    }
-
-    public function cardLinkUrl()
-    {
-        return ApiResponse::handle(
-            fn () => $this->barobillSoapService->getCardLinkRedirectUrl(),
-            __('message.fetched')
-        );
-    }
-
-    public function certificateUrl()
-    {
-        return ApiResponse::handle(
-            fn () => $this->barobillSoapService->getCertificateRedirectUrl(),
-            __('message.fetched')
-        );
-    }
-}