refactor: extract per-resource collectors from ListReachabilityTargets

[youngjinjung-linq]

Summary

Implements #202: ListReachabilityTargets fetched 8 resource types across 240 lines of inline mapping.

• Nine collector methods extracted (collectEC2InstanceTargets, collectENITargets, collectIGWTargets, collectVPCEndpointTargets, collectVPCPeeringTargets, collectTransitGatewayTargets, collectTransitGatewayAttachmentTargets, collectVPNGatewayTargets, collectVPCEndpointServiceTargets).
• ListReachabilityTargets is now a ~35-line coordinator: iterate the collector list, append, sort — adding a new target type is one collector plus one list entry.
• Field mapping, naming fallbacks, pagination, error wrapping, and result ordering are byte-for-byte unchanged.

Testing

• go test ./... passes, including the existing TestListReachabilityTargets_Success covering the merged output.
• make build passes.

Closes #202

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📥 Commits

Reviewing files that changed from the base of the PR and between 744b139 and 140333d.

📒 Files selected for processing (1)

• internal/services/aws/vpc.go

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[YoungJinJung]

Recreated as #262 from an in-repo branch under the maintainer account; this PR is superseded.