Allow users over their request quota to submit requests for admin approval #3592

Description

When a user hits their movie or TV quota, the request is rejected outright. MediaRequest.request() throws QuotaRestrictedError (server/entity/MediaRequest.ts, ~lines 150–166), which the route maps to a 403. Nothing is created, so an admin never sees it and the user has no way to ask for an exception.

The only bypass is ignoreQuota, which requires MANAGE_REQUESTS and is an admin action. Users who are over quota but have a legitimate need can't ask for approval.

Desired Behavior

When a non-admin user exceeds their quota, instead of a 403, create the request in PENDING status with a flag (for example quotaExceeded: true) so it:

• shows in the pending queue with a visible "over quota" badge,
• is approved through the existing flow, which then bypasses the quota check for that request.

The frontend would show "Over quota. Submit for approval?" in place of the error.

Quotas are a reasonable default, but a hard stop with no path forward means users either ask an admin out of band or give up. A pending-approval path keeps the quota as policy while letting admins make exceptions in the app.

Open questions

• Should an over-quota pending request count toward the quota while it waits?
• Should the admin approval UI show the user's current usage?
• Should this be opt-in via a setting, or on by default?

Additional Context

Related but different: #633 (bypass via series limit, closed), #1943 (combined limit, closed), #1509 (per-request season limit, open). This does not overlap with the in-flight quota fixes #3377 and #3378, which are about race conditions and editing.

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