fix(activity): keep long-lived connections active

[G4614]

Keep long-lived connections active by refreshing WebSocket activity and retaining proxy retries after an initial activity update failure.

Test plan:

• cd apps && go test ./proxy/pkg/proxy
• cd apps && yarn nx test api --runInBand --testPathPatterns=boxlite-ws-proxy.service.spec.ts
• cd apps && yarn eslint api/src/boxlite-rest/boxlite-ws-proxy.service.ts api/src/boxlite-rest/boxlite-ws-proxy.service.spec.ts
• cd apps && yarn tsc -p api/tsconfig.spec.json --noEmit
• make lint:fix
• cd apps && yarn nx test api --runInBand (blocked by the existing Jest ESM parsing issue in boxlite-rest-routing.spec.ts)

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