feat(secrets): support live box secret updates

[G4614]

Adds live box secret updates through the REST API, runner v0/v2, and gvproxy admin socket.

Test plan:

• go test ./... in src/deps/libgvproxy-sys/gvproxy-bridge
• BOXLITE_DEPS_STUB=1 cargo build -p boxlite-c
• go test -tags boxlite_dev ./pkg/api/dto ./pkg/api/controllers ./pkg/backend ./pkg/boxlite ./pkg/runner/v2/executor in apps/runner
• npx nx build api --configuration=development --skip-nx-cache in apps
• BOXLITE_DEPS_STUB=1 cargo test -p boxlite --lib net::gvproxy::config (compiles; filter reports 0 matched)

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