Add Scala 3.7 Dockerfile and project structure for HTTP server challenge

- Introduced Dockerfile for Scala 3.7 with SBT setup.
- Created project files including build.sbt, .gitignore, and scripts for local and remote execution.
- Implemented basic server code in App.scala with connection handling.
- Added configuration for CodeCrafters integration.

Author: andy1li

dockerfiles/scala-3.7.Dockerfile

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+# syntax=docker/dockerfile:1.7-labs
+FROM maven:3.9.9-eclipse-temurin-24-noble
+
+ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="build.sbt,project/assembly.sbt,project/build.properties"
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+RUN echo "deb https://repo.scala-sbt.org/scalasbt/debian all main" | tee /etc/apt/sources.list.d/sbt.list
+
+RUN echo "deb https://repo.scala-sbt.org/scalasbt/debian /" | tee /etc/apt/sources.list.d/sbt_old.list 
+
+RUN curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | gpg --no-default-keyring --keyring gnupg-ring:/etc/apt/trusted.gpg.d/scalasbt-release.gpg --import && \
+    chmod 644 /etc/apt/trusted.gpg.d/scalasbt-release.gpg
+
+RUN apt-get update && \
+    apt-get install --no-install-recommends sbt=1.11.7 -yqq && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+ENV PATH=/usr/local/sbt/bin:$PATH
+
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+WORKDIR /app
+
+RUN .codecrafters/compile.sh

solutions/scala/01-at4/code/.codecrafters/compile.sh

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+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+# The option is needed for Java 17+ to allow native memory access operations.
+SBT_OPTS="--enable-native-access=ALL-UNNAMED" sbt assembly

solutions/scala/01-at4/code/.codecrafters/run.sh

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+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+exec java -jar ./target/scala-3.7.4/http-server.jar "$@"

solutions/scala/01-at4/code/.gitattributes

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+* text=auto

solutions/scala/01-at4/code/.gitignore

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+# macOS
+.DS_Store
+
+# sbt specific
+dist/*
+debug/
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+project/local-plugins.sbt
+.history
+.ensime
+.ensime_cache/
+.sbt-scripted/
+local.sbt
+
+# Bloop
+.bsp
+
+# VS Code
+.vscode/
+
+# Metals
+.bloop/
+.metals/
+metals.sbt

solutions/scala/01-at4/code/README.md

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+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/http-server.png)
+
+This is a starting point for Scala solutions to the
+["Build Your Own HTTP server" Challenge](https://app.codecrafters.io/courses/http-server/overview).
+
+[HTTP](https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol) is the
+protocol that powers the web. In this challenge, you'll build a HTTP/1.1 server
+that is capable of serving multiple clients.
+
+Along the way you'll learn about TCP servers,
+[HTTP request syntax](https://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html),
+and more.
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your HTTP server implementation is in
+`src/main/scala/codecrafters_http_server/App.scala`. Study and uncomment the
+relevant code, and push your changes to pass the first stage:
+
+```sh
+git commit -am "pass 1st stage" # any msg
+git push origin master
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `sbt (1.11.7)` installed locally
+1. Run `./your_program.sh` to run your program, which is implemented in
+   `src/main/scala/codecrafters_http_server/App.scala`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.

solutions/scala/01-at4/code/build.sbt

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+ThisBuild / scalaVersion     := "3.7.4"
+ThisBuild / version          := "0.1.0-SNAPSHOT"
+ThisBuild / organization     := "com.codecrafters"
+ThisBuild / organizationName := "CodeCrafters"
+
+assembly / assemblyJarName := "http-server.jar"
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "codecrafter-http-server",
+    // List your dependencies here
+    libraryDependencies ++= Seq(
+    )
+  )

solutions/scala/01-at4/code/codecrafters.yml

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+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Scala version used to run your code
+# on Codecrafters.
+#
+# Available versions: scala-3.7
+buildpack: scala-3.7

solutions/scala/01-at4/code/project/assembly.sbt

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+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")

solutions/scala/01-at4/code/project/build.properties

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+sbt.version=1.11.7