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

FinlyticTechnicals/Strategies/ITechnicalStrategy.cs

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+using System.Collections.Generic;
+using FinlyticCore.Dtos.TechnicalAnalysis;
+
+namespace FinlyticTechnicals.Strategies;
+
+/// <summary>
+/// Strategy contract for evaluating technical context, indicators, and detected patterns to produce structured trading setups with an ExitPlan.
+/// </summary>
+public interface ITechnicalStrategy
+{
+    string StrategyKey { get; }
+    string StrategyName { get; }
+    int Priority { get; }
+
+    /// <summary>
+    /// Checks if this strategy is applicable in the current market regime.
+    /// </summary>
+    bool IsApplicable(MarketRegime regime);
+
+    /// <summary>
+    /// Evaluates technical context and active patterns to generate a StrategyResultDto or null.
+    /// </summary>
+    StrategyResultDto? Evaluate(TechnicalContext context, IReadOnlyList<PatternResultDto> activePatterns);
+}