fix: batch insert + heap-based rate limiter eviction

[poyrazK]

Summary

• N+1 query: CreateZoneWithRecords inserts records row-by-row #83 N+1 query: Replace row-by-row INSERT loop with multi-row VALUES batch in CreateZoneWithRecords
• Rate limiter evictOldestBucket() causes O(n) pause under high bucket count #72 Rate limiter O(n): Replace O(n) bounded scan eviction with O(log n) heap-based eviction

Changes

• internal/adapters/repository/postgres.go: Batch insert using multi-row VALUES with scalar args
• internal/dns/server/ratelimit.go: Min-heap keyed by last timestamp with heap.Fix on update, heap.Remove on Cleanup()

Test plan

• go build ./...
• go test ./internal/adapters/repository/... ./internal/dns/server/... -timeout 60s -race

Related issues

• Fixes N+1 query: CreateZoneWithRecords inserts records row-by-row #83
• Fixes Rate limiter evictOldestBucket() causes O(n) pause under high bucket count #72

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 21d70b1e-bacc-40d0-ac81-6920b3275fca

📥 Commits

Reviewing files that changed from the base of the PR and between 35810d9 and 47f7904.

📒 Files selected for processing (2)

• internal/adapters/repository/postgres.go
• internal/dns/server/ratelimit.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/performance-n-plus-one-and-rate-limiter

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[poyrazK]

It's okay to merge