[Feature]: Genie Spaces: Per-role UX complexity config + advanced creation dialog

Parent PRD

#108

What to build

Per-feature UX complexity configuration on roles, controlling which creation dialog controls are visible. Includes the advanced creation dialog with dataset cherry-picking and instruction editing.

• Role model extension: Add per-feature UX complexity field to the role model — a JSON map of { feature_id: "basic" | "advanced" }. Default: all features set to "basic" for consumer roles, "advanced" for producer/admin.
• Settings UI: Extend the role configuration in Settings to allow admins to set UX complexity per feature per role (e.g., "Basic Consumer" = basic for genie-spaces, "Advanced Consumer" = advanced).
• Frontend permission hook: Extend the permissions/role system to expose UX complexity level for the current user's role for a given feature. New hook or extension of usePermissions.
• Advanced creation dialog: When role has "advanced" for genie-spaces:
  • Dataset preview becomes a checklist — user can uncheck datasets to exclude them
  • Instructions section becomes editable — user can modify LLM-generated instructions
  • Additional metadata fields may be shown
• Basic creation dialog: When role has "basic" for genie-spaces:
  • Datasets auto-selected (read-only preview, no checkboxes)
  • Instructions auto-generated (not shown or shown read-only)
  • Simplified form with just name + TTL override
• Knowledge graph extensibility: Design the datasets field to accept entries from sources beyond products (future KG integration). Add a source field to each dataset entry (e.g., "product_output_port", "manual", "knowledge_graph").

Acceptance criteria

• Role model supports per-feature UX complexity (basic/advanced)
• Settings UI allows admins to configure complexity per role per feature
• Frontend reads UX complexity from role/permissions for current user
• Advanced dialog shows dataset checkboxes and instruction editor
• Basic dialog shows simplified form without advanced controls
• Dataset model supports source field for future extensibility
• Existing creation flow works correctly for both modes
• Role changes take effect on next page load (no app restart)

Blocked by

• Blocked by #111 (Create API + creation dialog)
• Blocked by #117 (Settings tab — role config lives in settings)

User stories addressed

• User story 4 (cherry-pick datasets — advanced mode)
• User story 5 (edit instructions — advanced mode)
• User story 6 (simplified creation — basic mode)
• User story 26 (per-role UX complexity configuration)