Add integration test

[bmcdonald3]

Summary

This PR introduces a new integration test for the DiscoverySnapshot API to verify the end-to-end flow from HTTP POST to database persistence. The test utilizes an in-memory Ent SQLite driver to ensure a clean, isolated environment without side effects on local storage.

Changes

New Test File: Created cmd/server/integration_test.go.

Logic Verified:

• Initialization of an in-memory SQLite database using enttest.
• Registration of required resource prefixes for the fabrica naming schema.
• Simulation of a POST /discoverysnapshots request with a complex hardware payload (Node, CPU, and DIMM).
• Verification of the 201 Created response and JSON body consistency.
• Verification that the record was correctly written to the storage layer via storage.LoadDiscoverySnapshot.

$ go test -v cmd/server/integration_test.go cmd/server/device_handlers_generated.go cmd/server/discoverysnapshot_handlers_generated.go cmd/se
rver/export.go cmd/server/import.go cmd/server/main.go cmd/server/models_generated.go cmd/server/openapi_generated.go cmd/server/routes_gener
ated.go
=== RUN   TestDiscoverySnapshotIntegration
--- PASS: TestDiscoverySnapshotIntegration (0.01s)
PASS
ok      command-line-arguments  1.954s