先のご回答をいただき、おかげさまでコンパイルエラーがなくなりました。ありがとうございます！

ProvisionException: Unable to provision / Error injecting constructor, java.lang.NullPointerException
provision-error-injecting-constructor-java-lang

ブラウザにviewは表示されるようになったのですが、以下のようなエラーが出ている状況です。

[debug] application - Directory for migration files found. db/migration/default
[info] play.api.Play - Application started (Dev)
[error] s.ActiveSession - Failed preparing the statement (Reason: Could not set parameter at position 1 (values was '0')    
Query - conn:8897(M)  - "insert into" customer (id3, status, name, sexType, zipCode1 + zipCode2, prefCode, cityName, addressName, building, email, phone, loginName, password, favoriteCategoryId)
values ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"):

  ()

 java.sql.SQLException: Could not set parameter at position 1 (values was '0')
 Query - conn:8897(M)  - "insert into" customer (id3, status, name, sexType, zipCode1 + zipCode2, prefCode, cityName, addressName, building, email, phone, loginName, password, favoriteCategoryId)
values ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.getSqlException(ExceptionMapper.java:211)
at org.mariadb.jdbc.MariaDbPreparedStatementClient.setParameter(MariaDbPreparedStatementClient.java:438)
at org.mariadb.jdbc.BasePrepareStatement.setString(BasePrepareStatement.java:1379)
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.setString(HikariProxyPreparedStatement.java)
at scalikejdbc.DBConnectionAttributesWiredPreparedStatement.setString(DBConnectionAttributesWiredPreparedStatement.scala:73)
at scalikejdbc.StatementExecutor.scalikejdbc$StatementExecutor$$bind(StatementExecutor.scala:95)
at scalikejdbc.StatementExecutor$$anonfun$bindParams$2.apply(StatementExecutor.scala:68)
at scalikejdbc.StatementExecutor$$anonfun$bindParams$2.apply(StatementExecutor.scala:67)
at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:778)
at scala.collection.immutable.List.foreach(List.scala:381)
at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:777)
at scalikejdbc.StatementExecutor.bindParams(StatementExecutor.scala:67)
at scalikejdbc.StatementExecutor.initialize(StatementExecutor.scala:51)
at scalikejdbc.StatementExecutor.<init>(StatementExecutor.scala:45)
at scalikejdbc.DBSession$class.createStatementExecutor(DBSession.scala:107)
at scalikejdbc.DBSession$class.updateWithFilters(DBSession.scala:476)
at scalikejdbc.ActiveSession.updateWithFilters(DBSession.scala:716)
at scalikejdbc.DBSession$class.updateWithFilters(DBSession.scala:456)
at scalikejdbc.ActiveSession.updateWithFilters(DBSession.scala:716)
at scalikejdbc.SQLUpdate.apply(SQL.scala:638)
at com.github.j5ik2o.spetstore.application.controller.SignupCustomerJson$$anonfun$1.apply(SignupControllerSupport.scala:140)
at com.github.j5ik2o.spetstore.application.controller.SignupCustomerJson$$anonfun$1.apply(SignupControllerSupport.scala:130)
at scalikejdbc.DBConnection$$anonfun$3.apply(DBConnection.scala:326)
at scalikejdbc.DBConnection$class.scalikejdbc$DBConnection$$rollbackIfThrowable(DBConnection.scala:290)
at scalikejdbc.DBConnection$class.localTx(DBConnection.scala:319)
at scalikejdbc.DB.localTx(DB.scala:60)
at scalikejdbc.DB$.localTx(DB.scala:263)
at com.github.j5ik2o.spetstore.application.controller.SignupCustomerJson$.insert(SignupControllerSupport.scala:130)
at com.github.j5ik2o.spetstore.application.controller.SignupController.insert(SignupController.scala:89)
at com.github.j5ik2o.spetstore.application.controller.SignupController$$anonfun$signupresult$1$$anonfun$apply$2.apply(SignupController.scala:79)
at com.github.j5ik2o.spetstore.application.controller.SignupController$$anonfun$signupresult$1$$anonfun$apply$2.apply(SignupController.scala:76)
at play.api.data.Form.fold(Form.scala:139)
at com.github.j5ik2o.spetstore.application.controller.SignupController$$anonfun$signupresult$1.apply(SignupController.scala:72)
at com.github.j5ik2o.spetstore.application.controller.SignupController$$anonfun$signupresult$1.apply(SignupController.scala:71)
at play.api.mvc.ActionBuilder$$anonfun$apply$13.apply(Action.scala:371)
at play.api.mvc.ActionBuilder$$anonfun$apply$13.apply(Action.scala:370)
at play.api.mvc.Action$.invokeBlock(Action.scala:498)
at play.api.mvc.Action$.invokeBlock(Action.scala:495)
at play.api.mvc.ActionBuilder$$anon$2.apply(Action.scala:458)
at play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5$$anonfun$apply$6.apply(Action.scala:112)
at play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5$$anonfun$apply$6.apply(Action.scala:112)
at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
at play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5.apply(Action.scala:111)
at play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5.apply(Action.scala:110)
at scala.Option.map(Option.scala:146)
at play.api.mvc.Action$$anonfun$apply$2.apply(Action.scala:110)
at play.api.mvc.Action$$anonfun$apply$2.apply(Action.scala:103)
at scala.concurrent.Future$$anonfun$flatMap$1.apply(Future.scala:251)
at scala.concurrent.Future$$anonfun$flatMap$1.apply(Future.scala:249)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

またhelperで受け取っているデータは、以下のクラスで定義されている型に合わせているのですが、

 case class CustomerJson(
  id: Option[String],
  name: String,
  sexType: Int,
  zipCode1: String,
  zipCode2: String,
  prefCode: Int,
  cityName: String,
  addressName: String,
  buildingName: Option[String],
  email: String,
  phone: String,
  loginName: String,
  password: String,
  favoriteCategoryId: Option[String],
  version: Option[Long]
)

ご指摘の通り、DBInitializer.scalaの方では、

                sql"""    
CREATE TABLE `customer` (
  `pk`                    BIGINT        NOT NULL AUTO_INCREMENT,
  `id`                    BIGINT        NOT NULL,    
  `status`                INT           NOT NULL,
  `name`                  VARCHAR(256)  NOT NULL,
  `sex_type`              INT       NOT NULL,
  `zip_code`              VARCHAR(20)   NOT NULL,
  `pref_code`             INT           NOT NULL,
  `city_name`             VARCHAR(256)  NOT NULL,
  `address_name`          VARCHAR(256)  NOT NULL,
  `building_name`         VARCHAR(256),
  `email`                 VARCHAR(64)   NOT NULL,
  `phone`                 VARCHAR(64)   NOT NULL,
  `login_name`            VARCHAR(64)   NOT NULL,
  `password`              VARCHAR(64)   NOT NULL,
  `favorite_category_id`  BIGINT,
  PRIMARY KEY(`pk`),
  UNIQUE(`id`)
 );
 """.execute().apply()

idがBIG INTになっているので、どうやって合わせれば良いのだろう・・・と考えてしまっているところです(サンプルが不完全なのか、自分で改変してしまっても問題ないのか、自信がないところでもあるのですが…）

なお、当初INSERT文に加えていた pkは、AUTO INCREMENTであるため、外した方がいいのかと思われ外しました（判断があってるのかもわかりません）。id3となっているのは、

https://github.com/scalikejdbc/scalikejdbc/issues/561

こちらを参考にして、

val point = SQLSyntax.createUnsafely(s"PointFromText(POINT($lat $long))")

この point にあたるものを(($lat $long)の部分に$idを入れて）改めて置いて見ただけなのですが、q.statement の部分をsqliterpolationで書く場合、どうしていいかもわからず無視してしまってるので、結局意味がない状況です。