refactor: Pekko migration

[warcholjakub]

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[Copilot]

Pull request overview

This pull request migrates the Scastie codebase from Akka to Apache Pekko, a significant refactoring that updates all actor-based components, HTTP server infrastructure, and remote communication protocols. The migration is comprehensive and touches all major modules including server, balancer, runners (sbt and scala-cli), and utilities.

Changes:

• Replaced all Akka imports with Apache Pekko equivalents across the entire codebase
• Updated configuration keys from "akka-port" to "remote-port" and "akka." to "pekko."
• Migrated third-party library dependencies (akka-http-circe → pekko-http-circe, akka-http-session → pekko-http-session, akka-http-cors → pekko-http-cors)
• Changed actor protocol URLs from "akka://" to "pekko://"
• Moved BlockingProcess from akka.contrib.process package to org.scastie.util
• Updated all logback configuration to use org.apache.pekko logger names
• Updated environment variables and deployment configuration

Reviewed changes

Copilot reviewed 62 out of 63 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
utils/src/test/scala/org/scastie/util/ProcessActorTest.scala	Updated test imports to Pekko actor and testkit
utils/src/main/scala/org/scastie/util/ScalaCliTask.scala	Updated ActorRef import to Pekko
utils/src/main/scala/org/scastie/util/SbtTask.scala	Updated ActorRef import to Pekko
utils/src/main/scala/org/scastie/util/ReconnectingActor.scala	Updated actor imports and renamed port fields to serverRemotePort/actorRemotePort
utils/src/main/scala/org/scastie/util/ProcessActor.scala	Updated all Pekko actor and stream imports, removed akka.contrib.process
utils/src/main/scala/org/scastie/util/GraphStageLogicForwarder.scala	Updated stream stage imports to Pekko
utils/src/main/scala/org/scastie/util/GraphStageForwarder.scala	Updated stream stage imports to Pekko
utils/src/main/scala/org/scastie/util/BlockingProcess.scala	Moved from akka.contrib.process to org.scastie.util, updated all imports and config references
utils/src/main/resources/reference.conf	Updated configuration keys from akka to pekko, renamed akka-port to remote-port
storage/src/test/resources/logback.xml	Updated logger name to org.apache.pekko
server/src/test/scala/org/scastie/web/SnippetIdMatcherTests.scala	Updated HTTP test imports and circe support library
server/src/test/resources/application.conf	Updated actor provider to fully qualified Pekko class name
server/src/main/scala/org/scastie/server/routes/*.scala	Updated all HTTP and actor imports across all route files
server/src/main/scala/org/scastie/server/oauth2/*.scala	Updated session library imports to pekko-http-session
server/src/main/scala/org/scastie/server/ServerMain.scala	Updated actor system, HTTP, and CORS imports; updated config key references
server/src/main/scala/org/scastie/server/RestApiServer.scala	Updated pattern matching and actor imports
server/src/main/resources/reference.conf	Updated all configuration from akka to pekko namespace
server/src/main/resources/logback.xml	Updated logger name to org.apache.pekko
scala-cli-runner/src/test/scala/org/scastie/scalacli/ScalaCliRunnerTest.scala	Updated test actor imports
scala-cli-runner/src/test/resources/.xml,.conf	Updated test configuration for Pekko
scala-cli-runner/src/main/scala/org/scastie/scalacli/*.scala	Updated all actor and pattern imports, renamed port references
scala-cli-runner/src/main/resources/.xml,.conf	Updated runtime configuration for Pekko
sbt-runner/src/test/scala/org/scastie/sbt/SbtActorTest.scala	Updated test actor imports
sbt-runner/src/test/resources/application.conf	Updated test configuration for Pekko
sbt-runner/src/main/scala/org/scastie/sbt/*.scala	Updated all actor imports, renamed port references, updated actor URLs
sbt-runner/src/main/resources/.xml,.conf	Updated runtime configuration for Pekko
run.sh	Updated environment variable from SERVER_AKKA_PORT to SERVER_REMOTE_PORT
project/Deployment.scala	Updated config key from akka-port to remote-port
deployment/*.conf	Updated deployment configurations for staging, production, and local environments
deployment/logback.xml	Updated logger name in production logback config
build.sbt	Updated all dependencies from Akka to Pekko, including versions
balancer/src/test/scala/org/scastie/balancer/DispatchActorIntegrationTest.scala	Updated integration test imports and renamed port variables
balancer/src/test/resources/application.conf	Updated actor provider configuration
balancer/src/main/scala/org/scastie/balancer/*.scala	Updated all actor, stream, and event imports across balancer actors
balancer/src/main/resources/reference.conf	Updated actor configuration warning setting
CONTRIBUTING.md	Updated architecture documentation to reference pekko-remote instead of akka-remote

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