fix: sidebar accordion + koja slug + support ticket LINQ crash

Sidebar:
- All groups start collapsed on first load (v4 storage key resets old state)
- Opening one group closes all others (accordion)
- Navigating to a section opens only that section's group

Koja slug:
- SlugHelper: Persian->Latin transliteration, slug validation
- Registration accepts optional custom slug; auto-derives from cafe name
- Slug can be updated from dashboard Settings -> Profile
- Settings PATCH validates uniqueness (SLUG_TAKEN) and format (INVALID_SLUG)
- koja.meezi.ir/{slug} now redirects to /fa/cafe/{slug} (short URL support)

Bug fix:
- SupportTicketService: cafeId/status filters applied before Select() projection
  to fix EF "could not be translated" crash on the support tickets page

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Meezi.API/Validators/AuthValidators.cs

@@ -1,6 +1,7 @@
 using FluentValidation;
 using Meezi.API.Models.Auth;
 using Meezi.Core.Utilities;
+using System.Text.RegularExpressions;
 
 namespace Meezi.API.Validators;
 
@@ -51,6 +52,10 @@ public class RegisterRequestValidator : AbstractValidator<RegisterRequest>
             .NotEmpty()
             .MaximumLength(100)
             .WithMessage("Cafe name must be between 1 and 100 characters.");
+
+        RuleFor(x => x.Slug)
+            .Must(s => s == null || SlugHelper.IsValidSlug(s))
+            .WithMessage("Slug must be 2-80 lowercase letters, digits, or hyphens (e.g. my-cafe).");
     }
 }
 

src/Meezi.API/Validators/PatchCafeSettingsRequestValidator.cs

@@ -1,5 +1,6 @@
 using FluentValidation;
 using Meezi.API.Models.Cafes;
+using Meezi.Core.Utilities;
 
 namespace Meezi.API.Validators;
 
@@ -8,6 +9,10 @@ public class PatchCafeSettingsRequestValidator : AbstractValidator<PatchCafeSett
     public PatchCafeSettingsRequestValidator()
     {
         RuleFor(x => x.Name).MaximumLength(200).When(x => x.Name is not null);
+        RuleFor(x => x.Slug)
+            .Must(s => s == null || SlugHelper.IsValidSlug(s))
+            .WithMessage("Slug must be 2-80 lowercase letters, digits, or hyphens (e.g. my-cafe).")
+            .When(x => x.Slug is not null);
         RuleFor(x => x.Phone).MaximumLength(20).When(x => x.Phone is not null);
         RuleFor(x => x.Address).MaximumLength(500).When(x => x.Address is not null);
         RuleFor(x => x.City).MaximumLength(100).When(x => x.City is not null);