fix: address auth map growth, quota rollback, body close, and CSI shutdown

[poyrazK]

Summary

• auth.go (AuthService failedAttempts and lockouts maps grow without cleanup #280): add hard size limits (maxFailedAttemptsMap=1000, maxLockoutsMap=10000) for deterministic eviction supplementing probabilistic purge
• instance.go (Async task: quota reserved before enqueue with no rollback on failure #297): rollback vCPU/memory quota when taskQueue.Enqueue fails after IncrementUsage
• gateway_e2e_test.go (Response body not closed when HTTP status is not OK in gateway test #307): defer resp.Body.Close() covers all code paths, not just HTTP 200
• csi-driver/main.go (CSI driver signal handler goroutine has no cleanup mechanism #283): wait for d.Stop() completion with 5s timeout before exiting

Test plan

• go build ./internal/core/services/... ./cmd/... ./tests/...
• go vet ./internal/core/services/... ./cmd/...
• go test -race ./internal/core/services/... -count=1

Fixes #280, #297, #307, #283

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 16d68e39-bca0-48cc-8410-53b2720b5ef5

📥 Commits

Reviewing files that changed from the base of the PR and between 98cd65c and e152404.

📒 Files selected for processing (4)

• cmd/csi-driver/main.go
• internal/core/services/auth.go
• internal/core/services/instance.go
• tests/gateway_e2e_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/batch-2026-05-02

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[poyrazK]

It's okay to merge