[cdalar]

This PR adds support for specifying both the bridge name and the CIDR in a single string using the bridge/cidr format for the fc.network.bridge configuration option.

This addresses an issue where the custom bridge and CIDR configuration was being ignored in certain builds.

Testing:

• Verified that fc.network.bridge can now be set to mybr0/10.0.0.1/24.
• Verified that existing functionality (setting bridge and CIDR separately) still works.
• Ran go test ./internal/providerfc/... and all tests passed.

[cdalar]

The Build (stable) check failed on da4b701, but the failure is unrelated to this PR's change (only internal/providerfc/common.go/common_test.go were touched here).

TestActionCmd_DownloadFile_404 (in cmd/coverage_test.go, pre-existing on main) calls out to the external https://httpstat.us/404 service and asserts the error contains "404". In this run that service returned 502 Bad Gateway instead:

Error: "download failed with status: 502 Bad Gateway" does not contain "404"

No fix for this exists on main yet (the test relies on a live third-party endpoint, so it's inherently flaky). I've re-run the failed jobs once; if it fails again for the same reason, that's a pre-existing issue outside this PR's scope to fix.

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