Lives in Yavsc.Blogs (not Yavsc.Api) because Yavsc.Api is not
yet enabled in production; future migration to Yavsc.Api is a
single namespace + route prefix change.
Endpoint: GET /api/user-search?q=<name>&e=<email>&take=<n>
- Authorisation: [Authorize] (any authenticated caller).
- q: case-insensitive substring match on FullName OR UserName.
- e: case-insensitive exact match on Email.
- take: 1..100, default 25.
Returns a flat UserSearchResultDto (Id, UserName, FullName,
Avatar, Email) — no navigation properties, so the payload
stays small even if the user table grows.
The Email field is included because the address-book use case
(composing circle membership, sending invites) needs it.
On Yavsc's single-tenant deployments the user table is a
closed community; multi-tenant deployments should gate this
controller behind a tenant-scoped policy before exposing it.
The trade-off is documented in the controller's class-level
XML doc.
