## Summary
Hide Google/GitHub SSO login options when the UI is accessed from
**non‑local** addresses.
This PR also adds a **static whitelist** (editable in code) so we can
allow additional hosts if needed.
Default whitelisted addresses:
1. `localhost` and any subdomain: `*.localhost`
2. IPv4 loopback `127.0.0.0/8` (e.g., `127.x.y.z`)
4. IPv6 loopback `::1` (including equivalent textual forms such as
`::0001`)
## Changes
- **What**:
* Add `src/utils/hostWhitelist.ts` with `normalizeHost` and
`isHostWhitelisted` helpers.
* Update `SignInContent.vue` to **hide** SSO options when
`isHostWhitelisted(normalizeHost(window.location.hostname))` returns
`false`.
- **Breaking**:
* Users accessing from Runpod or other previously allowed **non‑local**
hosts will **lose** SSO login options.
If we need to keep SSO there, we should add those hosts to the whitelist
in `hostWhitelist.ts`.
## Review Focus
1. Verify that logging in from local addresses (`localhost`,
`*.localhost`, `127.0.0.1`, `::1`) **does not change** the current
behavior: SSO is visible.
2. Verify that from a **non‑local** address, SSO options are **not**
displayed.
## Screenshots (if applicable)
UI opened from `192.168.2.109` address:
<img width="500" height="990" alt="Screenshot From 2025-09-27 13-22-15"
src="https://github.com/user-attachments/assets/c97b10a1-b069-43e4-a26b-a71eeb228a51"
/>
UI opened from default `127.0.0.1` address(nothing changed):
<img width="462" height="955" alt="Screenshot From 2025-09-27 13-35-27"
src="https://github.com/user-attachments/assets/bb2bf21c-dc8d-49cb-b48e-8fc6e408023c"
/>
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5815-feat-auth-Allow-SSO-login-only-for-whitelisted-addresses-localhost-27b6d73d365081ccbe84c034cf8e416d)
by [Unito](https://www.unito.io)
