Add PocketBase client with contracts and sharp build tooling

Elternbeirat.Contracts/Post.cs

@@ -0,0 +1,34 @@
+using System.Text.Json.Serialization;
+
+namespace Elternbeirat.Contracts;
+
+/// <summary>A news post. Sorted by <see cref="Date"/>, newest first.</summary>
+public record Post
+{
+    /// <summary>PocketBase record id.</summary>
+    [JsonPropertyName("id")]
+    public string Id { get; init; } = "";
+
+    /// <summary>
+    /// Publication date. Stored as UTC by PocketBase but read as local time
+    /// (Europe/Berlin) by convention; only the date part is shown.
+    /// </summary>
+    [JsonPropertyName("date")]
+    public DateTime Date { get; init; }
+
+    /// <summary>Post heading shown to visitors; may contain umlauts and spaces.</summary>
+    [JsonPropertyName("title")]
+    public string Title { get; init; } = "";
+
+    /// <summary>Post body in Markdown.</summary>
+    [JsonPropertyName("body")]
+    public string Body { get; init; } = "";
+
+    /// <summary>URL slug (lowercase, no umlauts), e.g. "herbstbasar" -> /posts/herbstbasar.</summary>
+    [JsonPropertyName("slug")]
+    public string Slug { get; init; } = "";
+
+    /// <summary>Whether the post is visible to visitors.</summary>
+    [JsonPropertyName("public")]
+    public bool Public { get; init; }
+}