Restructures project with feature-based organization

Refactors project structure to support modular, feature-driven development

Introduces comprehensive language localization support
Adds menu management with role-based access control
Implements dynamic sidebar and theme switching capabilities

Enhances project scalability and maintainability

app/Features/Language/Models/SupportedCulture.cs

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+namespace CalendarServer.Features.Language.Models;
+
+public class SupportedCulture
+{
+    public required string Code { get; set; }
+    public required string Name { get; set; }
+    public required string NativeName { get; set; }
+}

app/Features/Language/Services/ILocalizationService.cs

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+using CalendarServer.Features.Language.Models;
+
+namespace CalendarServer.Features.Language.Services;
+
+public interface ILocalizationService
+{
+    string Get(string key, string? culture = null);
+    string CurrentCulture { get; }
+    IEnumerable<SupportedCulture> GetSupportedCultures();
+}

app/Features/Language/Services/JsonLocalizationService.cs

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+using System.Text.Json;
+using CalendarServer.Features.Language.Models;
+
+namespace CalendarServer.Features.Language.Services;
+
+public class JsonLocalizationService : ILocalizationService
+{
+    private readonly string _translationsPath;
+
+    public JsonLocalizationService(IWebHostEnvironment env)
+    {
+        _translationsPath = Path.Combine(env.ContentRootPath, "Features", "Language", "Translations");
+    }
+
+    public string CurrentCulture => "en";
+
+    public string Get(string key, string? culture = null)
+    {
+        culture ??= CurrentCulture;
+        var filePath = Path.Combine(_translationsPath, $"{culture}.json");
+
+        if (!File.Exists(filePath))
+            return key;
+
+        var json = File.ReadAllText(filePath);
+        var doc = JsonDocument.Parse(json);
+
+        var parts = key.Split('.');
+        JsonElement current = doc.RootElement;
+
+        foreach (var part in parts)
+        {
+            if (!current.TryGetProperty(part, out current))
+                return key;
+        }
+
+        return current.GetString() ?? key;
+    }
+
+    public IEnumerable<SupportedCulture> GetSupportedCultures()
+    {
+        return new List<SupportedCulture>
+        {
+            new() { Code = "da", Name = "Danish", NativeName = "Dansk" },
+            new() { Code = "en", Name = "English", NativeName = "English" }
+        };
+    }
+}

app/Features/Language/TagHelpers/LocalizeTagHelper.cs

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+using Microsoft.AspNetCore.Razor.TagHelpers;
+using CalendarServer.Features.Language.Services;
+
+namespace CalendarServer.Features.Language.TagHelpers;
+
+[HtmlTargetElement(Attributes = "localize")]
+public class LocalizeTagHelper : TagHelper
+{
+    private readonly ILocalizationService _localize;
+
+    public LocalizeTagHelper(ILocalizationService localize)
+    {
+        _localize = localize;
+    }
+
+    [HtmlAttributeName("localize")]
+    public string Key { get; set; } = string.Empty;
+
+    public override void Process(TagHelperContext context, TagHelperOutput output)
+    {
+        var translated = _localize.Get(Key);
+
+        if (!string.IsNullOrEmpty(translated) && translated != Key)
+        {
+            output.Content.SetContent(translated);
+        }
+
+        output.Attributes.RemoveAll("localize");
+    }
+}

app/Features/Language/Translations/da.json

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+{
+  "menu": {
+    "home": "Dashboard",
+    "calendar": "Kalender",
+    "pos": "Kasse",
+    "products": "Produkter & Lager",
+    "suppliers": "Leverandører",
+    "customers": "Kunder",
+    "employees": "Medarbejdere",
+    "reports": "Statistik & Rapporter",
+    "settings": "Indstillinger",
+    "account": "Abonnement & Konto"
+  },
+  "groups": {
+    "dashboard": "Dashboard",
+    "data": "Data",
+    "analytics": "Analyse",
+    "system": "System"
+  },
+  "common": {
+    "save": "Gem",
+    "cancel": "Annuller",
+    "search": "Søg",
+    "close": "Luk",
+    "delete": "Slet",
+    "edit": "Rediger",
+    "add": "Tilføj"
+  },
+  "sidebar": {
+    "lockScreen": "Lås skærm",
+    "appName": "Salon OS"
+  }
+}

app/Features/Language/Translations/en.json

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+{
+  "menu": {
+    "home": "Dashboard",
+    "calendar": "Calendar",
+    "pos": "Point of Sale",
+    "products": "Products & Inventory",
+    "suppliers": "Suppliers",
+    "customers": "Customers",
+    "employees": "Employees",
+    "reports": "Statistics & Reports",
+    "settings": "Settings",
+    "account": "Subscription & Account"
+  },
+  "groups": {
+    "dashboard": "Dashboard",
+    "data": "Data",
+    "analytics": "Analytics",
+    "system": "System"
+  },
+  "common": {
+    "save": "Save",
+    "cancel": "Cancel",
+    "search": "Search",
+    "close": "Close",
+    "delete": "Delete",
+    "edit": "Edit",
+    "add": "Add"
+  },
+  "sidebar": {
+    "lockScreen": "Lock screen",
+    "appName": "Salon OS"
+  }
+}