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Charis 22886fd304 feat(studio): add flag-gated general region selection (#51274)
## Problem

We want to be able to show free-plan organizations a simplified region
selector that only lists general regions (Americas, Europe,
Asia-Pacific), controlled per organization through ConfigCat.

## Solution

- ConfigCat flags are now evaluated with `organization_slug` and
`organization_created_at` (Unix seconds) custom attributes, so flags can
target and bucket by organization.
- `organization_created_at` is read from `GET
/platform/organizations/{slug}`, fetched only for free-plan
organizations, since the organization list response doesn't include it.
- Two flags:
- `freeTierGeneralRegionEnrollment`: the organization is enrolled
(control or test).
- `freeTierGeneralRegionSelection`: the organization sees only general
regions.
- For enrolled free organizations, the region selector stays in its
loading state until flags have been evaluated with the organization's
creation time, so specific regions aren't shown and then removed.
- In the test variant, the selector hides specific regions and shows a
footer linking to the plan upgrade panel. High Availability keeps its
own region list.
- Telemetry: new `free_tier_general_region_experiment_exposed` and
`free_tier_general_region_upgrade_clicked` events, and
`freeTierGeneralRegionExperiment` / `regionSelectionType` properties on
`project_creation_simple_version_submitted`.
- `created_at` is added to `OrganizationSlugResponse` in the generated
platform types, matching the API.

## Review instructions

1. With both flags off, open `/new/[slug]` for a free organization and
confirm the region selector is unchanged.
2. Using the dev toolbar, set `freeTierGeneralRegionEnrollment` and
`freeTierGeneralRegionSelection` to `true`. Confirm only general regions
are listed and the footer links to the billing plan panel.
3. Set `freeTierGeneralRegionSelection` to `false` and confirm the full
selector is shown.
4. Repeat with a paid organization and confirm the full selector is
always shown.
2026-10-07 09:43:28 -04:00
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