[Feature]: Estate: Instance Identity in Settings

Parent PRD

#143

What to build

Add ONTOS_INSTANCE_ID and ONTOS_INSTANCE_NAME to the application settings, configurable via the Settings UI. These fields identify the local Ontos instance for federation purposes.

• Add fields to the Settings model in config.py with defaults derived from DATABRICKS_WORKSPACE_ID + DATABRICKS_APP_NAME
• Expose in the Settings UI so admins can override the defaults
• The instance ID is stamped on all exported entities in subsequent slices

See "Instance Identity" section of the parent PRD for full details.

Acceptance criteria

• ONTOS_INSTANCE_ID and ONTOS_INSTANCE_NAME fields exist in Settings model
• Defaults are derived from DATABRICKS_WORKSPACE_ID + DATABRICKS_APP_NAME when not explicitly set
• Settings UI shows instance identity fields and allows editing
• Instance identity values are accessible via get_settings() throughout the app

Blocked by

None - can start immediately

User stories addressed

• User story 1

Start with the Settings model in config.py, then locate the Settings UI and get_settings() callers. Implement the two identity fields, their derived defaults and editable UI values, and verify that get_settings() exposes the configured values throughout the app.