feat(core): Send user agent for public api events (no-changelog)

[dariacodes]

Summary

We want to send a custom user agent when public API will be used from CLI, so we need to include it in telemetry.

Related Linear tickets, Github issues, and Community forum posts

Closes ADO-4973

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with Backport to Beta, Backport to Stable, or Backport to v1 (if the PR is an urgent fix that needs to be backported)

[cubic-dev-ai]

No issues found across 4 files

Architecture diagram

sequenceDiagram
    participant Client as External Client / CLI
    participant API as PublicApiKeyService
    participant Bus as EventService
    participant Relay as TelemetryEventRelay
    participant Telemetry as TelemetryService

    Note over Client,Telemetry: Public API Telemetry Flow

    Client->>API: HTTP Request (Headers: User-Agent, API Key)
    
    API->>API: Authenticate API Key
    
    API->>Bus: NEW: emit('public-api-invoked', { ..., userAgent })
    Note right of API: Extracts 'user-agent' from req.headers

    Bus->>Relay: Handle 'public-api-invoked'
    
    Relay->>Relay: Map internal event to telemetry schema
    
    Relay->>Telemetry: CHANGED: track('User invoked API', { ..., user_agent })
    Note right of Relay: user_agent included in telemetry payload

    Telemetry-->>Relay: Ack
    API-->>Client: HTTP Response (200 OK)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[n8n-assistant]

Got released with n8n@2.14.0