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/Models/Auth/AuthDtos.cs

@@ -15,7 +15,8 @@ public record SwitchCafeRequest(string CafeId);
 public record SwitchBranchRequest(string? BranchId);
 
 /// <summary>Step 1 of self-registration: send OTP to a new phone number.</summary>
-public record RegisterRequest(string Phone, string CafeName);
+/// <param name="Slug">Optional custom Koja slug (e.g. "lamiz-enghelab"). Auto-derived from CafeName if omitted.</param>
+public record RegisterRequest(string Phone, string CafeName, string? Slug = null);
 
 /// <summary>Step 2 of self-registration: verify OTP and create the cafe account.</summary>
 public record VerifyRegisterRequest(string Phone, string Code);

src/Meezi.API/Models/Cafes/CafeSettingsDtos.cs

@@ -19,6 +19,8 @@ public record CafeSettingsDto(
 
 public record PatchCafeSettingsRequest(
     string? Name,
+    /// <summary>Custom Koja profile slug (e.g. "lamiz-enghelab"). Must be unique across all cafés.</summary>
+    string? Slug,
     string? Phone,
     string? Address,
     string? City,