fix(auth): MoySklad admin endpoint uses policy-based auth on role claim directly

ASP.NET Core's [Authorize(Roles=...)] relies on ClaimsIdentity.RoleClaimType to
match, which may not be wired to "role" in the OpenIddict validation handler's
identity (depending on middleware order with AddIdentity). Tokens clearly carry
"role": "Admin" but IsInRole("Admin") returns false.

- Register AddAuthorization policy "AdminAccess" that checks the `role` claim
  explicitly (c.Type == Claims.Role && Value in {Admin, SuperAdmin}). Works
  regardless of how ClaimsIdentity was constructed.
- MoySkladImportController now uses [Authorize(Policy = "AdminAccess")].
- Add /api/_debug/whoami that echoes authType, roleClaimType, claims, and
  IsInRole result — makes next auth issue trivial to diagnose.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/food-market.api/Controllers/Admin/MoySkladImportController.cs

@@ -5,7 +5,7 @@
 namespace foodmarket.Api.Controllers.Admin;
 
 [ApiController]
-[Authorize(Roles = "Admin,SuperAdmin")]
+[Authorize(Policy = "AdminAccess")]
 [Route("api/admin/moysklad")]
 public class MoySkladImportController : ControllerBase
 {

src/food-market.api/Program.cs

@@ -111,7 +111,13 @@
         options.DefaultAuthenticateScheme = OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme;
         options.DefaultChallengeScheme = OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme;
     });
-    builder.Services.AddAuthorization();
+    builder.Services.AddAuthorization(opts =>
+    {
+        // Check the "role" claim explicitly — robust against role-claim-type mismatches between
+        // OpenIddict validation identity and the default ClaimTypes.Role uri.
+        opts.AddPolicy("AdminAccess", p => p.RequireAssertion(ctx =>
+            ctx.User.HasClaim(c => c.Type == Claims.Role && (c.Value == "Admin" || c.Value == "SuperAdmin"))));
+    });
 
     builder.Services.AddControllers();
     builder.Services.AddEndpointsApiExplorer();
@@ -143,6 +149,21 @@
 
     app.MapGet("/health", () => Results.Ok(new { status = "ok", time = DateTime.UtcNow }));
 
+    app.MapGet("/api/_debug/whoami", (HttpContext ctx) =>
+    {
+        var identity = ctx.User.Identity as System.Security.Claims.ClaimsIdentity;
+        return Results.Ok(new
+        {
+            isAuthenticated = ctx.User.Identity?.IsAuthenticated,
+            authType = ctx.User.Identity?.AuthenticationType,
+            nameClaimType = identity?.NameClaimType,
+            roleClaimType = identity?.RoleClaimType,
+            isInRoleAdmin = ctx.User.IsInRole("Admin"),
+            hasAdminRoleClaim = ctx.User.HasClaim(c => c.Type == Claims.Role && c.Value == "Admin"),
+            claims = ctx.User.Claims.Select(c => new { c.Type, c.Value }),
+        });
+    }).RequireAuthorization();
+
     app.MapGet("/api/me", (HttpContext ctx) =>
     {
         var user = ctx.User;