EsupPortail / Esup-Pod / 19566963541

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:bug: Normalize malformed referrer URLs missing double slash (#1379)

# :bug: [FIX] Normalize malformed referrer URLs missing double slash

Some external requests send a malformed `referrer` such as:

* `http:/pod.univ-lille.fr/...`
* `https:/pod.univ-lille.fr/...`

These URLs have a missing slash after the scheme (`:/` instead of `://`), and Pod never generates them internally.
They currently trigger `SuspiciousOperation("referrer is not internal")`, causing unnecessary admin error emails.

This PR adds a **minimal and safe normalization**:

* `https:/…` → `https://…`
* `http:/…` → `http://…`

Nothing else is changed.

2 of 4 new or added lines in 1 file covered. (50.0%)

12200 of 17435 relevant lines covered (69.97%)

0.7 hits per line