Improve CV parsing and profile editor flow

JobTrackerApi/Services/CvAiClassifier.cs

@@ -0,0 +1,65 @@
+using System.Net.Http;
+using System.Text;
+using System.Text.Json;
+
+namespace JobTrackerApi.Services;
+
+public sealed record CvBlockClassificationResult(
+    string? Section,
+    double? Confidence,
+    string? Reason,
+    string? Title,
+    string? Company,
+    string? Location,
+    string? Start,
+    string? End,
+    List<string>? Bullets);
+
+public interface ICvAiClassifier
+{
+    Task<CvBlockClassificationResult?> ClassifyBlockAsync(string block, CancellationToken cancellationToken = default);
+}
+
+public sealed class CvAiClassifier : ICvAiClassifier
+{
+    private readonly IHttpClientFactory _httpClientFactory;
+
+    public CvAiClassifier(IHttpClientFactory httpClientFactory)
+    {
+        _httpClientFactory = httpClientFactory;
+    }
+
+    public async Task<CvBlockClassificationResult?> ClassifyBlockAsync(string block, CancellationToken cancellationToken = default)
+    {
+        if (string.IsNullOrWhiteSpace(block)) return null;
+
+        try
+        {
+            var client = _httpClientFactory.CreateClient("ai-service");
+            var payload = JsonSerializer.Serialize(new { block });
+            using var content = new StringContent(payload, Encoding.UTF8, "application/json");
+            using var response = await client.PostAsync("/cv/classify-block", content, cancellationToken);
+            if (!response.IsSuccessStatusCode) return null;
+
+            await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
+            var parsed = await JsonSerializer.DeserializeAsync<CvBlockClassificationResult>(stream, new JsonSerializerOptions(JsonSerializerDefaults.Web)
+            {
+                PropertyNameCaseInsensitive = true
+            }, cancellationToken);
+
+            return parsed;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+}
+
+public sealed class NoOpCvAiClassifier : ICvAiClassifier
+{
+    public static NoOpCvAiClassifier Instance { get; } = new();
+    private NoOpCvAiClassifier() { }
+    public Task<CvBlockClassificationResult?> ClassifyBlockAsync(string block, CancellationToken cancellationToken = default)
+        => Task.FromResult<CvBlockClassificationResult?>(null);
+}