feat: Fixes build issues, adds ApiController module.

Sources/App/Extensions/ApiController+respond.swift

@@ -0,0 +1,37 @@
+import ApiController
+import ManualDCore
+import Vapor
+
+extension ApiController {
+
+  func respond(_ route: SiteRoute.Api, request: Vapor.Request) async throws
+    -> any AsyncResponseEncodable
+  {
+    guard let encodable = try await json(.init(route: route, logger: request.logger)) else {
+      return HTTPStatus.ok
+    }
+    return AnyJSONResponse(value: encodable)
+  }
+}
+
+struct AnyJSONResponse: AsyncResponseEncodable {
+  public var headers: HTTPHeaders = ["Content-Type": "application/json"]
+  let value: any Encodable
+
+  init(additionalHeaders: HTTPHeaders = [:], value: any Encodable) {
+    if additionalHeaders.contains(name: .contentType) {
+      self.headers = additionalHeaders
+    } else {
+      headers.add(contentsOf: additionalHeaders)
+    }
+    self.value = value
+  }
+
+  func encodeResponse(for request: Request) async throws -> Response {
+    try Response(
+      status: .ok,
+      headers: headers,
+      body: .init(data: JSONEncoder().encode(value))
+    )
+  }
+}