OPNsense plugin for Gateway 2.0

[moubctez]

#239

[Copilot]

Pull request overview

Updates the Defguard Gateway OPNsense plugin and gateway service metadata to align with Defguard Gateway 2.0 configuration, notably shifting to the new grpc_port/cert_dir-based setup.

Changes:

• Update gateway CLI/version reporting and build metadata/dependencies for 2.0.0.
• Revise OPNsense plugin model/form/template to match Gateway 2.0 config options (e.g., grpc_port, cert_dir, firewall/health options).
• Improve OPNsense UI flow by adding an explicit Stop action and gating restart on successful reconfigure.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/config.rs	Uses the crate VERSION (incl. git SHA) for clap version output.
build.rs	Adjusts vergen git2 emission to only include SHA.
Cargo.toml	Bumps clap and defguard git dependencies; simplifies vergen-git2 spec.
Cargo.lock	Lockfile updates for dependency bumps (toml, winnow, defguard git rev, etc.).
opnsense/src/opnsense/service/templates/OPNsense/DefguardGateway/config.toml	Reworks generated config for Gateway 2.0 fields (grpc_port, cert_dir, etc.).
opnsense/src/opnsense/mvc/app/views/OPNsense/DefguardGateway/index.volt	Adds Stop button and restart gating after reconfigure.
opnsense/src/opnsense/mvc/app/models/OPNsense/DefguardGateway/DefguardGateway.xml	Updates the plugin model fields/validation for new Gateway 2.0 options.
opnsense/src/opnsense/mvc/app/controllers/OPNsense/DefguardGateway/forms/general.xml	Updates the UI form fields to match the updated model/config template.
opnsense/src/etc/inc/plugins.inc.d/defguardgateway.inc	Aligns enabled flag naming and tightens device regex to the selected interface.
opnsense/Makefile	Bumps plugin version to 2.0.0.

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