Initial commit: Predictalytics solution

Clean Architecture .NET 8 solution (Domain/Application/Infrastructure/Api/Worker/WinFormsHost)
for analyzing Polymarket traders for copytrading/strategy-replication candidates.

Includes EF Core InitialBaseline migration and DB secrets removed from source/config
in preparation for version control.

src/Predictalytics.Domain/Interfaces/IMarketRepository.cs

@@ -0,0 +1,19 @@
+using Predictalytics.Domain.Entities;
+using Predictalytics.Domain.Enums;
+
+namespace Predictalytics.Domain.Interfaces;
+
+public interface IMarketRepository
+{
+    Task<Market?> GetByPlatformIdAsync(PlatformType platform, string platformMarketId, CancellationToken ct = default);
+    Task<MarketOutcome?> GetOutcomeByTokenIdAsync(string tokenId, CancellationToken ct = default);
+    Task<IReadOnlyList<MarketOutcome>> GetOutcomesByTokenIdsAsync(IEnumerable<string> tokenIds, CancellationToken ct = default);
+    Task AddOrUpdateAsync(Market market, CancellationToken ct = default);
+    Task AddOrUpdateRangeAsync(IEnumerable<Market> markets, CancellationToken ct = default);
+    Task<IReadOnlyList<Market>> GetActiveAsync(int count = 50, CancellationToken ct = default);
+    Task<int> GetCountAsync(CancellationToken ct = default);
+    Task<IReadOnlyList<Market>> GetMarketsDueForTradeUpdateAsync(int cooldownHours, int limit, CancellationToken ct = default);
+    Task UpdateAsync(Market market, CancellationToken ct = default);
+    Task<Market?> GetByIdAsync(int id, CancellationToken ct = default);
+    Task<IReadOnlyList<Market>> SearchAsync(string query, int take = 20, CancellationToken ct = default);
+}