feat(KAN-70): integrate native workspace and update settings

native/src-tauri/gen/apple/Sources/kanbangit-native/WorkspacePolicy.swift

@@ -65,3 +65,32 @@ struct WorkspaceConnection {
         return true
     }
 }
+
+
+enum NativeSettingsError: Error { case invalidRequest, incompatibleVersion, invalidServer }
+
+struct NativeSettingsRequest {
+    let id: Int
+    let action: String
+    let payload: [String: Any]
+
+    static func parse(_ body: String) throws -> NativeSettingsRequest {
+        guard body.utf8.count <= 8192,
+              let value = try JSONSerialization.jsonObject(with: Data(body.utf8)) as? [String: Any],
+              Set(value.keys) == Set(["version", "id", "action", "payload"]),
+              let version = value["version"] as? NSNumber, CFGetTypeID(version) != CFBooleanGetTypeID(),
+              version == 1 else { throw NativeSettingsError.incompatibleVersion }
+        guard let id = value["id"] as? NSNumber, CFGetTypeID(id) != CFBooleanGetTypeID(),
+              id.doubleValue >= 0, id.doubleValue <= 9007199254740991, id.doubleValue.rounded() == id.doubleValue,
+              let action = value["action"] as? String,
+              let payload = value["payload"] as? [String: Any] else { throw NativeSettingsError.invalidRequest }
+        switch action {
+        case "getState", "settingsReady", "openSettings":
+            guard payload.isEmpty else { throw NativeSettingsError.invalidRequest }
+        case "setWorkspace":
+            guard Set(payload.keys) == Set(["server"]), payload["server"] is String else { throw NativeSettingsError.invalidRequest }
+        default: throw NativeSettingsError.invalidRequest
+        }
+        return NativeSettingsRequest(id: id.intValue, action: action, payload: payload)
+    }
+}