feat: add General Ledger integration and financial reporting features

- Implemented General Ledger client component for managing GL integration.
- Created a dedicated page for General Ledger configuration.
- Developed Finance Report client component for generating various financial reports.
- Added report blocks for structured display of financial data.
- Introduced API endpoints for fetching GL accounts and financial reports.
- Updated navigation to include links for GL integration and financial reports.
- Enhanced permissions to manage GL and view financial reports.
- Updated appsettings to include General Ledger API configuration.

Distribution/Features/GeneralLedger/GlJson.cs

@@ -0,0 +1,33 @@
+using System.Text.Json;
+
+namespace Distribution.Features.GeneralLedger;
+
+/// <summary>Small readers for the GL service's ApiResponse envelope ({statusCode, success, message, data}).</summary>
+public static class GlJson
+{
+    public static JsonElement? Data(GeneralLedgerResult result) =>
+        result.Body is { ValueKind: JsonValueKind.Object } body && Get(body, "data") is { } data ? data : null;
+
+    public static string? Message(GeneralLedgerResult result) =>
+        result.Body is { ValueKind: JsonValueKind.Object } body ? Get(body, "message")?.GetString()
+            ?? Get(body, "Message")?.GetString() : null;
+
+    /// <summary>Case-insensitive property lookup (GL success bodies are camelCase, its error bodies PascalCase).</summary>
+    public static JsonElement? Get(JsonElement element, string name)
+    {
+        if (element.ValueKind != JsonValueKind.Object) return null;
+        foreach (var p in element.EnumerateObject())
+            if (string.Equals(p.Name, name, StringComparison.OrdinalIgnoreCase)) return p.Value;
+        return null;
+    }
+
+    public static string? GetString(JsonElement element, string name)
+    {
+        var v = Get(element, name);
+        return v is null || v.Value.ValueKind == JsonValueKind.Null ? null
+            : v.Value.ValueKind == JsonValueKind.String ? v.Value.GetString() : v.Value.ToString();
+    }
+
+    public static long? GetLong(JsonElement element, string name) =>
+        long.TryParse(GetString(element, name), out var n) ? n : null;
+}