Send only changing fields for status updates and add server-side update flow.
- Trimmed telemetry JSON payload in misc/api.func to include only status, error, and exit_code (removed static fields and pve_version) so updates are minimal.
- Added TelemetryStatusUpdate type and new PBClient methods: FindRecordByRandomID, UpdateTelemetryStatus, and UpsertTelemetry in misc/data/service.go. UpsertTelemetry creates a record for status="installing", otherwise finds the record by random_id and PATCHes only status/error/exit_code (fallbacks to create if not found).
- Relaxed validation logic in validate(): detect updates (status != "installing") and skip certain strict numeric checks for update requests while keeping required fields and other validations.
- Main handler now calls UpsertTelemetry instead of CreateTelemetry and logs generic errors.
These changes allow idempotent, minimal updates to existing telemetry records and avoid repeatedly sending/storing unchanged metadata.
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