New fields: GlobalAwsSettings.default_model_id, plus
GlobalOllamaSettings and GlobalOpenAiCompatibleSettings (base_url +
default_model_id each). When a per-project base_url or model_id is
blank, the container env vars and config fingerprints fall back to
the global value. Container recreation is triggered whenever the
resolved value changes, so editing a global default updates existing
projects on next start.
UI: added the new fields to AwsSettings and two new global settings
components, slotted into the Backends accordion.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
