Fix stack and API naming to follow kebab-case convention

Pin existing CloudFormation stack name via stackName property so
the live stack is not affected. Construct ID and API Gateway name
now follow the org kebab-case standard.

bin/app.ts

@@ -4,6 +4,7 @@ import * as cdk from "aws-cdk-lib";
 import { DoorUnlockStack } from "../lib/door-unlock-stack";
 
 const app = new cdk.App();
-new DoorUnlockStack(app, "SeaHavenDoorUnlockStack", {
+new DoorUnlockStack(app, "door-unlock-api", {
+  stackName: "SeaHavenDoorUnlockStack",
   env: { account: "328440206208", region: "us-east-1" },
 });

lib/door-unlock-stack.ts

@@ -64,7 +64,7 @@ export class DoorUnlockStack extends cdk.Stack {
     doorIdParam.grantRead(unlockHandler);
 
     const httpApi = new apigwv2.HttpApi(this, "DoorUnlockApi", {
-      apiName: "SeaHavenDoorUnlock",
+      apiName: "door-unlock-api",
     });
 
     const defaultStage = httpApi.defaultStage!.node.defaultChild as apigwv2.CfnStage;