fix(auth): read role claim under mapped name so Owner/Manager gates work

ROOT CAUSE of demo-seed/billing/etc. returning 403 for real owners: .NET's JWT
handler remaps the short "role" claim to ClaimTypes.Role on inbound, so
TenantMiddleware's FindFirst("role") returned null and tenant.Role (EmployeeRole?)
stayed null. EnsureManager/EnsureOwner then rejected even a valid Owner token with
MANAGER_REQUIRED / OWNER_REQUIRED, while reads (no role gate) worked and
[Authorize(Roles=...)] worked (it reads the remapped claim). Now reads the role
under both MeeziClaimTypes.Role ("role") and ClaimTypes.Role. Same fix applied to
the AuthController whoami role. Fixes demo seed, subscription billing, and every
other tenant.Role-gated action.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Meezi.API/Controllers/AuthController.cs

@@ -198,7 +198,10 @@ public class AuthController : ControllerBase
             ExpiresAt: expiresAt,
             UserId: userId,
             CafeId: User.FindFirstValue(MeeziClaimTypes.CafeId) ?? string.Empty,
-            Role: User.FindFirstValue(MeeziClaimTypes.Role) ?? string.Empty,
+            // .NET remaps the short "role" claim to ClaimTypes.Role on inbound; read both.
+            Role: User.FindFirstValue(MeeziClaimTypes.Role)
+                ?? User.FindFirstValue(System.Security.Claims.ClaimTypes.Role)
+                ?? string.Empty,
             PlanTier: User.FindFirstValue(MeeziClaimTypes.PlanTier) ?? string.Empty,
             Language: User.FindFirstValue(MeeziClaimTypes.Language) ?? string.Empty,
             Actor: User.FindFirstValue(MeeziClaimTypes.Actor) ?? MeeziActorKinds.Merchant,

src/Meezi.API/Middleware/TenantMiddleware.cs

@@ -92,7 +92,12 @@ public class TenantMiddleware
         {
             scopedMerchant.CafeId = cafeId;
 
-            var roleClaim = context.User.FindFirst(MeeziClaimTypes.Role)?.Value;
+            // .NET's JWT handler remaps the short "role" claim to ClaimTypes.Role
+            // on inbound, so FindFirst("role") returns null and tenant.Role would
+            // stay null — making EnsureManager/EnsureOwner reject even a real owner.
+            // Read both the raw claim and the mapped one.
+            var roleClaim = context.User.FindFirst(MeeziClaimTypes.Role)?.Value
+                ?? context.User.FindFirst(System.Security.Claims.ClaimTypes.Role)?.Value;
             if (Enum.TryParse<EmployeeRole>(roleClaim, ignoreCase: true, out var role))
                 scopedMerchant.Role = role;