feat: Initial duct sizing view and calculations, need to add supply and return trunk sizing.

Sources/ManualDCore/DuctSizing.swift

@@ -0,0 +1,69 @@
+import Dependencies
+import Foundation
+
+public enum DuctSizing {
+
+  public struct RoomContainer: Codable, Equatable, Sendable {
+
+    public let registerID: String
+    public let roomID: Room.ID
+    public let roomName: String
+    public let heatingLoad: Double
+    public let coolingLoad: Double
+    public let heatingCFM: Double
+    public let coolingCFM: Double
+    public let designCFM: DesignCFM
+    public let roundSize: Double
+    public let finalSize: Int
+    public let velocity: Int
+    public let flexSize: Int
+
+    public init(
+      registerID: String,
+      roomID: Room.ID,
+      roomName: String,
+      heatingLoad: Double,
+      coolingLoad: Double,
+      heatingCFM: Double,
+      coolingCFM: Double,
+      designCFM: DesignCFM,
+      roundSize: Double,
+      finalSize: Int,
+      velocity: Int,
+      flexSize: Int
+    ) {
+      self.registerID = registerID
+      self.roomID = roomID
+      self.roomName = roomName
+      self.heatingLoad = heatingLoad
+      self.coolingLoad = coolingLoad
+      self.heatingCFM = heatingCFM
+      self.coolingCFM = coolingCFM
+      self.designCFM = designCFM
+      self.roundSize = roundSize
+      self.finalSize = finalSize
+      self.velocity = velocity
+      self.flexSize = flexSize
+    }
+  }
+
+  public enum DesignCFM: Codable, Equatable, Sendable {
+    case heating(Double)
+    case cooling(Double)
+
+    public init(heating: Double, cooling: Double) {
+      if heating >= cooling {
+        self = .heating(heating)
+      } else {
+        self = .cooling(cooling)
+      }
+    }
+
+    public var value: Double {
+      switch self {
+      case .heating(let value): return value
+      case .cooling(let value): return value
+      }
+    }
+  }
+}