[FA-misc] Translation engine work

FictionArchive.Service.TranslationService/Services/TranslationEngines/NanoGpt/NanoGptDtos.cs

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+using System.Text.Json.Serialization;
+
+namespace FictionArchive.Service.TranslationService.Services.TranslationEngines.NanoGpt;
+
+public sealed record NanoGptMessage(
+    [property: JsonPropertyName("role")] string Role,
+    [property: JsonPropertyName("content")] string Content);
+
+public sealed record NanoGptChatRequest(
+    [property: JsonPropertyName("model")] string Model,
+    [property: JsonPropertyName("messages")] IReadOnlyList<NanoGptMessage> Messages,
+    [property: JsonPropertyName("temperature")] double Temperature);
+
+public sealed record NanoGptChatResponse(
+    [property: JsonPropertyName("choices")] IReadOnlyList<NanoGptChoice> Choices,
+    [property: JsonPropertyName("usage")] NanoGptUsage Usage);
+
+public sealed record NanoGptChoice(
+    [property: JsonPropertyName("message")] NanoGptMessage Message);
+
+public sealed record NanoGptUsage(
+    [property: JsonPropertyName("prompt_tokens")] int PromptTokens,
+    [property: JsonPropertyName("completion_tokens")] int CompletionTokens,
+    [property: JsonPropertyName("total_tokens")] int TotalTokens);