Implement A3, A4, A5, B3: Add MarketOutcomePriceSnapshot, implement Polymarket CLOB prices-history endpoint, improve strategy classification, introduce CopytradingScore, and decouple/optimize scoring pipeline into a separate worker

src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketApiClient.cs

@@ -1,4 +1,5 @@
 using System.Net.Http.Json;
+using System.Text.Json.Serialization;
 using Microsoft.Extensions.Logging;
 using Predictalytics.Application.Interfaces;
 using Predictalytics.Domain.Enums;
@@ -13,11 +14,13 @@ public class PolymarketApiClient
 {
     private readonly HttpClient _client;
     private readonly HttpClient _gammaClient;
+    private readonly HttpClient _clobClient;
     private readonly IRateLimiter _rateLimiter;
     private readonly ILogger<PolymarketApiClient> _logger;
 
     private const string DataApiBase = "https://data-api.polymarket.com";
     private const string GammaApiBase = "https://gamma-api.polymarket.com";
+    private const string ClobApiBase = "https://clob.polymarket.com";
 
     public PolymarketApiClient(IHttpClientFactory httpFactory, IRateLimiter rateLimiter, ILogger<PolymarketApiClient> logger)
     {
@@ -29,6 +32,10 @@ public class PolymarketApiClient
         _gammaClient.BaseAddress = new Uri(GammaApiBase);
         _gammaClient.DefaultRequestHeaders.Add("Accept", "application/json");
 
+        _clobClient = httpFactory.CreateClient("PolymarketClob");
+        _clobClient.BaseAddress = new Uri(ClobApiBase);
+        _clobClient.DefaultRequestHeaders.Add("Accept", "application/json");
+
         _rateLimiter = rateLimiter;
         _logger = logger;
     }
@@ -161,4 +168,22 @@ public class PolymarketApiClient
             return default;
         }
     }
+
+    public async Task<List<PriceHistoryEntry>> GetPricesHistoryAsync(string clobTokenId, string interval = "6h", CancellationToken ct = default)
+    {
+        var url = $"/prices-history?market={clobTokenId}&interval={interval}";
+        var result = await ExecuteWithRetryAsync<PolymarketPriceHistoryResponse>(_clobClient, url, ct);
+        return result?.History ?? [];
+    }
+}
+
+public class PolymarketPriceHistoryResponse
+{
+    [JsonPropertyName("history")] public List<PriceHistoryEntry> History { get; set; } = [];
+}
+
+public class PriceHistoryEntry
+{
+    [JsonPropertyName("t")] public long Timestamp { get; set; }
+    [JsonPropertyName("p")] public double Price { get; set; }
 }