Telemetry Events

Telemetry proxy endpoint for anonymous OSS adoption tracking.

This endpoint receives telemetry events from OSS installations and forwards them
to Amplitude using Papr's API key (which stays secure on the server).

**Privacy**:
- All user IDs are hashed/anonymized
- No PII is collected
- Data is used only for understanding OSS adoption patterns

**Opt-in**: Users must explicitly enable telemetry in their OSS installation.

**Request Body**:
```json
{
  "events": [
    {
      "event_name": "memory_created",
      "properties": {
        "type": "text",
        "has_metadata": true
      },
      "user_id": "hashed_user_id",
      "timestamp": 1234567890000
    }
  ],
  "anonymous_id": "session_id"
}
```