feat(technicals): add technical analysis microservice with indicator engines, pattern detectors, and strategies

FinlyticTechnicals/Patterns/IPatternDetector.cs

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+using FinlyticCore.Dtos.TechnicalAnalysis;
+
+namespace FinlyticTechnicals.Patterns;
+
+/// <summary>
+/// Isolated detector contract for a specific candlestick, chart, or SMC pattern.
+/// </summary>
+public interface IPatternDetector
+{
+    PatternType HandledType { get; }
+    PatternCategory Category { get; }
+
+    /// <summary>
+    /// Evaluates the technical context and returns a detected pattern or null if conditions are not met.
+    /// </summary>
+    PatternResultDto? Evaluate(TechnicalContext context);
+}