Refactor auth to AuthHex

Distribution/Infra/Authorization/Middleware/JwtOptions.cs

@@ -0,0 +1,13 @@
+namespace Distribution.Infra.Authorization.Middleware;
+
+/// <summary>
+/// Ported from OSMCore's System/Authentication/JwtOptions.cs. Binds to the same "Jwt" config
+/// section already used by Program.cs's AddJwtBearer setup (Jwt:PublicKey/Audience/Issuer) — no
+/// new config keys needed.
+/// </summary>
+public sealed record JwtOptions
+{
+    public string PublicKey { get; init; } = string.Empty;
+    public string Audience { get; init; } = string.Empty;
+    public string Issuer { get; init; } = string.Empty;
+}