fix: address 6 input validation issues

[poyrazK]

Summary

Fix 6 input validation issues across 4 files:

• OVS adapter (repositories/ovs/adapter.go): Validate remoteIP with net.ParseIP in CreateVXLANTunnel and DeleteVXLANTunnel — prevents command injection and malformed IP usage (No validation of remoteIP in OvsAdapter CreateVXLANTunnel and DeleteVXLANTunnel #255)
• Instance service (services/instance.go): Add iteration limit to findAvailableIP — prevents infinite loop when all IPs in subnet are taken (findAvailableIP loops forever when all IPs are taken #262)
• Instance service (services/instance.go): Add overflow check before memory calculation in resize path (Integer overflow in CPU and memory calculation for instance types #263)
• PowerDNS (adapters/dns/powerdns.go): Clarify nameserver access after empty check (Potential panic in PowerDNS CreateZone when nameservers slice is empty #258)
• Docker snapshot path (repositories/docker/snapshot_path.go): Add symlink detection to path validation — prevents symlink-based traversal escapes (Weak path traversal check in docker/adapter.go RestoreVolumeSnapshot #239, Weak path traversal check in docker/adapter.go CreateVolumeSnapshot #238)

Test plan

• go build ./...
• go test ./internal/repositories/ovs/... ./internal/core/services/... ./internal/adapters/dns/... ./internal/repositories/docker/... -count=1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 998031b7-41a7-46bb-9f60-09fe9450bb11

📥 Commits

Reviewing files that changed from the base of the PR and between 98cd65c and 4257b4a.

📒 Files selected for processing (4)

• internal/adapters/dns/powerdns.go
• internal/core/services/instance.go
• internal/repositories/docker/snapshot_path.go
• internal/repositories/ovs/adapter.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/input-validation-group-e

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[poyrazK]

It's okay to merge