fix: response-key casing for EC2/NetworkManager reads + duplicate DescribeConnections call

[agudmund]

Fixes #1.

What this changes

All fixes are response-key casing corrections along the camelCase/PascalCase split between the AWS APIs (Direct Connect speaks camelCase; EC2 and Network Manager speak PascalCase). 15 lines changed, no behavior added.

get_vpn_details — reads the PascalCase VgwTelemetry fields (Status, OutsideIpAddress, StatusMessage, AcceptedRouteCount), plus State and Routes. Before this, every tunnel rendered as null/0 and tunnels_up was always 0, contradicting network_architecture_summary which already read Status correctly.

get_virtual_gateway_details — reads State, and VpcId inside VpcAttachments. The vpc_id fix is one additional instance of the same defect found while preparing this PR (not listed in #1): attached VPC ids previously came back null.

analyze_cloudwan_topology — reads PascalCase State for global networks, core networks, and peerings. The output key is also normalized from "State" to "state" to match every other tool in the file; flagging this explicitly since it is a (small) output-schema change — the previous value was always null, so nothing working can break.

get_dx_vif_details — reads camelCase amazonSideAsn (Direct Connect is the camelCase API; this one was inverted in the other direction).

Duplicate API call — describe_connections().get("connections", dx.describe_connections()...) evaluated its fallback eagerly, making two DescribeConnections calls per invocation and discarding the second result (three sites). The fallback is dropped, matching what network_architecture_summary already does.

I chose direct key corrections over wiring in the existing _get_key() helper to keep the diff minimal and reviewable; happy to rework onto _get_key() if you'd prefer that direction.

Testing

• python -m py_compile server.py passes.
• Field names verified against the boto3/API documentation for DescribeVpnConnections, DescribeVpnGateways, DescribeGlobalNetworks, ListCoreNetworks, ListPeerings, and DescribeVirtualInterfaces.
• I don't have DX/VPN/Cloud WAN resources deployed to run a live end-to-end check, so a maintainer smoke test against a real account would be a welcome double-check.

Licensing

I confirm this contribution is made under the terms of the MIT-0 license of this repository.