[client] Clean up bsd routes independently of the state file

[lixmal]

Describe your changes

This marks routes with the flag RTF_PROTO1 (configurable via NB_ROUTE_PROTO_FLAG env) so they can be removed even if the state file is corrupted or unavailable.

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• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)

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[Copilot]

Pull Request Overview

This PR implements independent cleanup of BSD routes by marking them with a configurable RTF_PROTO flag, allowing route removal even when the state file is corrupted or unavailable.

• Routes are now marked with RTF_PROTO1 flag (configurable via NB_ROUTE_PROTO_FLAG environment variable)
• New FlushMarkedRoutes() method removes all marked routes independently of the state file
• Renamed NewSysOps() to New() for consistency

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
client/server/state.go	Calls FlushMarkedRoutes during residual state restoration for non-advanced routing
client/internal/statemanager/manager.go	Improved debug message to include file path
client/internal/routemanager/systemops/systemops_unix.go	Adds route marking logic, FlushMarkedRoutes implementation, and configurable RTF_PROTO flag
client/internal/routemanager/systemops/systemops_generic_test.go	Updates test calls to use renamed New() function
client/internal/routemanager/systemops/systemops_bsd_test.go	Updates test calls to use renamed New() function
client/internal/routemanager/systemops/systemops.go	Renames NewSysOps to New
client/internal/routemanager/systemops/state.go	Updates cleanup code to use New() and fixes variable naming
client/internal/routemanager/systemops/flush_nonbsd.go	Provides no-op FlushMarkedRoutes implementation for non-BSD platforms
client/internal/routemanager/manager.go	Updates manager initialization to use renamed New() function

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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