test: 프론트엔드/백엔드 테스트 커버리지 및 시나리오 보강 (Issue #291)

- FE: Vitest 환경 구축 및 공통 UI 컴포넌트(Badge, Button) 테스트 추가
- FE: Playwright E2E 테스트(Auth, Tenant CRUD 및 Validation) 시나리오 보강
- BE: Testcontainers 기반 Repository 통합 테스트(PostgreSQL) 추가
- BE: TenantRepository 계층 구조(Hierarchy), DB 제약조건(Unique) 테스트
- BE: UserRepository 통합 테스트(CRUD, Delete) 추가
- BE: PasswordPolicy 유틸리티 테스트 보강
- BE: TenantService 엣지 케이스(중복 슬러그, 권한 등) 검증 로직 추가
- Fix: 하위 테넌트 생성 시 ParentID 누락 문제 해결

backend/go.mod

@@ -24,7 +24,10 @@ require (
 )
 
 require (
+	dario.cat/mergo v1.0.2 // indirect
+	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/ClickHouse/ch-go v0.69.0 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/andybalholm/brotli v1.2.0 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.17 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.17 // indirect
@@ -37,13 +40,28 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.13 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.41.6 // indirect
 	github.com/aws/smithy-go v1.24.0 // indirect
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/containerd/errdefs v1.0.0 // indirect
+	github.com/containerd/errdefs/pkg v0.3.0 // indirect
+	github.com/containerd/log v0.1.0 // indirect
+	github.com/containerd/platforms v0.2.1 // indirect
+	github.com/cpuguy83/dockercfg v0.3.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/distribution/reference v0.6.0 // indirect
+	github.com/docker/docker v28.5.2+incompatible // indirect
+	github.com/docker/go-connections v0.6.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/ebitengine/purego v0.8.4 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-faster/city v1.0.1 // indirect
 	github.com/go-faster/errors v0.7.1 // indirect
 	github.com/go-jose/go-jose/v4 v4.1.3 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/goccy/go-json v0.10.4 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
@@ -58,21 +76,45 @@ require (
 	github.com/lestrrat-go/iter v1.0.2 // indirect
 	github.com/lestrrat-go/jwx/v2 v2.1.6 // indirect
 	github.com/lestrrat-go/option v1.0.1 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/magiconair/properties v1.8.10 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/moby/docker-image-spec v1.3.1 // indirect
+	github.com/moby/go-archive v0.1.0 // indirect
+	github.com/moby/patternmatcher v0.6.0 // indirect
+	github.com/moby/sys/sequential v0.6.0 // indirect
+	github.com/moby/sys/user v0.4.0 // indirect
+	github.com/moby/sys/userns v0.1.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/paulmach/orb v0.12.0 // indirect
 	github.com/pierrec/lz4/v4 v4.1.22 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
 	github.com/segmentio/asm v1.2.1 // indirect
+	github.com/shirou/gopsutil/v4 v4.25.6 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
 	github.com/stretchr/objx v0.5.2 // indirect
+	github.com/testcontainers/testcontainers-go v0.40.0 // indirect
+	github.com/testcontainers/testcontainers-go/modules/postgres v0.40.0 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasthttp v1.51.0 // indirect
 	github.com/valyala/tcplisten v1.0.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
 	go.opentelemetry.io/otel v1.39.0 // indirect
+	go.opentelemetry.io/otel/metric v1.39.0 // indirect
 	go.opentelemetry.io/otel/trace v1.39.0 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/exp v0.0.0-20220921023135-46d9e7742f1e // indirect