stacklok / toolhive / 21396017644

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Add CLI flags for header forward configuration (#3452)

Add --remote-forward-headers and --remote-forward-headers-secret flags
to both thv proxy and thv run commands for configuring header injection
to remote MCP servers.

Changes:
- header_flags.go: Shared parsing logic for header flags and secrets
- proxy.go: Add flags and wire middleware into proxy command
- run_flags.go: Add flags to RunFlags struct and builder options
- header_forward.go: Add HeaderForwardMiddlewareName constant

The --remote-forward-headers-secret option resolves values from the
ToolHive secrets manager, keeping sensitive data out of process listings
and RunConfig persistence.

Related: #3316

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