feat: Refactors / renames some modules.

Sources/ApiController/Internal/MoldRisk.swift

@@ -0,0 +1,72 @@
+import Logging
+import PsychrometricClient
+import Routes
+
+extension PsychrometricClient {
+
+  private func calculateProperties(_ request: MoldRisk.Request) async throws -> PsychrometricProperties {
+    try await psychrometricProperties(.dryBulb(request.temperature, relativeHumidity: request.humidity))
+  }
+
+  func respond(_ request: MoldRisk.Request, _ logger: Logger) async throws -> MoldRisk.Response {
+    let properties = try await calculateProperties(request)
+    let riskLevel = MoldRisk.RiskLevel(humidity: request.humidity)
+
+    return .init(
+      psychrometricProperties: properties,
+      riskLevel: riskLevel,
+      daysToMold: riskLevel.daysToMold,
+      recommendations: .recommendations(for: request, dewPoint: properties.dewPoint, riskLevel: riskLevel)
+    )
+  }
+}
+
+private extension MoldRisk.RiskLevel {
+  init(humidity: RelativeHumidity) {
+    if humidity < 60 {
+      self = .low
+    } else if humidity < 70 {
+      self = .moderate
+    } else if humidity < 80 {
+      self = .high
+    } else {
+      self = .severe
+    }
+  }
+
+  var daysToMold: Int? {
+    switch self {
+    case .low: return nil
+    case .moderate: return 30
+    case .high: return 14
+    case .severe: return 7
+    }
+  }
+}
+
+private extension Array where Element == String {
+  static func recommendations(
+    for request: MoldRisk.Request,
+    dewPoint: DewPoint,
+    riskLevel: MoldRisk.RiskLevel
+  ) -> Self {
+    var recommendations = [String]()
+    if request.humidity < 60 {
+      recommendations.append(
+        "Reduce indoor relative humidity below 60% using dehumidification"
+      )
+    }
+    if (request.temperature.fahrenheit - dewPoint.fahrenheit) < 4 {
+      recommendations.append(
+        "Increase air temperature or improve insulation to prevent condensation"
+      )
+    }
+    if riskLevel != .low {
+      recommendations.append(contentsOf: [
+        "Improve ventilation to reduce moisture accumulation",
+        "Inspect for and repair any water leaks or intrusion"
+      ])
+    }
+    return recommendations
+  }
+}