refactor: modular init, add bedrock loader, dynamic java/healthcheck

- Split monolithic init into modular lib files under scripts/lib/
  (common.sh, java.sh, server.sh, loaders/{vanilla,paper,fabric,forge,neoforge}.sh)
- Add bedrock loader: downloads from Minecraft Services API,
  runs native binary with LD_LIBRARY_PATH, skips Java setup
- Add auto-detection for JAVA_VERSION from Mojang version manifest
  (MC 1.20.5+ -> temurin@21, 1.17-1.20.4 -> temurin@17,
   1.17 -> temurin@16, pre-1.17 -> temurin@8)
- Fix NEW_FORGE unbound variable when non-Forge loaders run
- Fix Fabric loader jq filter (-s slurp removed, null string check fixed)
- Fix Forge test detection (recursive find for forge-*-server.jar)
- Dynamic healthcheck: nc -z TCP 25565 for Java, nc -zu UDP 19132 for bedrock
- Add .gitea/workflows/build-dev.yml for dev branch CI builds
- Base image: debian:bookworm-slim (from ubuntu:noble)
- Add unzip, netcat-openbsd to Docker image
- Switch to shebangs, set -euo pipefail throughout

scripts/lib/loaders/bedrock.sh

@@ -0,0 +1,41 @@
+BEDROCK_API_URL="https://net.web.minecraft-services.net/api/v1.0/download/links"
+BEDROCK_FALLBACK_URL="https://raw.githubusercontent.com/kittizz/bedrock-server-downloads/refs/heads/main/bedrock-server-downloads.json"
+
+_bedrockDownload() {
+  local platform="$1"
+  local version="${2:-}"
+
+  local DL_URL
+  DL_URL=$(curl -sL -A "Mozilla/5.0 (X11; Linux x86_64)" "$BEDROCK_API_URL" | jq -r '.result.links[] | select(.downloadType == "'"$platform"'") | .downloadUrl // empty')
+  if [[ -z "$DL_URL" ]]; then
+    DL_URL=$(curl -sL -A "Mozilla/5.0 (X11; Linux x86_64)" "$BEDROCK_FALLBACK_URL" |
+      jq --arg type "$( [[ "$platform" == *Preview* ]] && echo preview || echo release )" -r '
+        .[$type] | to_entries | sort_by(.key | split(".") | map(tonumber)) | last | .value.linux.url // empty
+      ')
+  fi
+  if [[ -z "$DL_URL" ]]; then
+    echo "Failed to look up Bedrock download URL"
+    crash
+  fi
+
+  if [[ -n "$version" ]]; then
+    DL_URL=$(echo "$DL_URL" | sed -E "s/(bedrock-server-)[^/]+(\.zip)/\1${version}\2/")
+  fi
+
+  VER=$(echo "$DL_URL" | grep -oP 'bedrock-server-\K[\d.]+(?=\.zip)')
+  echo "$DL_URL"
+  curl -o bedrock-server.zip -L -A "Mozilla/5.0 (X11; Linux x86_64)" "$DL_URL"
+  unzip -o bedrock-server.zip
+  rm -f bedrock-server.zip
+  chmod +x bedrock_server
+}
+
+getBedrock() {
+  SERVER_TYPE="Bedrock Server"
+  _bedrockDownload "serverBedrockLinux" "${MC_VERSION:-}"
+}
+
+getBedrockPreview() {
+  SERVER_TYPE="Bedrock Server (Preview)"
+  _bedrockDownload "serverBedrockPreviewLinux" "${MC_VERSION:-}"
+}

scripts/lib/loaders/fabric.sh

@@ -0,0 +1,22 @@
+getFabric() {
+  SERVER_TYPE="Fabric Minecraft"
+  LATEST_BUILD=$(curl -s https://meta.fabricmc.net/v2/versions/loader/${MC_VERSION} | jq -r '.[0].loader.version')
+  LATEST_INSTALLER=$(curl -s https://maven.fabricmc.net/net/fabricmc/fabric-installer/maven-metadata.xml | xmllint --xpath "/metadata/versioning/latest/text()" -)
+
+  if [[ -z "$MC_VERSION" ]]; then
+    echo "Minecraft version not set"
+    exit 1
+  fi
+  VER=$MC_VERSION
+
+  VER_LOADER="${FABRIC_LOADER_VERSION:-${LATEST_BUILD}}"
+  DL_URL=https://meta.fabricmc.net/v2/versions/loader/${MC_VERSION}/${VER_LOADER}/${LATEST_INSTALLER}/server/jar
+
+  if [ "$LATEST_BUILD" != "null" ]; then
+    echo "$DL_URL"
+    curl -o server.jar "${DL_URL}"
+  else
+    echo "No valid Fabric build found for version ${MC_VERSION}"
+    crash
+  fi
+}

scripts/lib/loaders/forge.sh

@@ -0,0 +1,42 @@
+getForge() {
+  SERVER_TYPE="Forge Server"
+
+  if [[ -n "$MC_VERSION" ]]; then
+    VER_MINECRAFT=$MC_VERSION
+    if [[ -n "${FORGE_VERSION}" ]]; then
+      VER_LOADER="${FORGE_VERSION}"
+      DL_URL=https://maven.minecraftforge.net/net/minecraftforge/forge/${VER_MINECRAFT}-${VER_LOADER}/forge-${VER_MINECRAFT}-${VER_LOADER}-installer.jar
+    else
+      LATEST_BUILD=$(curl -s https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json | jq -r ".promos[\"${VER_MINECRAFT}-latest\"]")
+      VER_LOADER=$LATEST_BUILD
+      DL_URL=https://maven.minecraftforge.net/net/minecraftforge/forge/${VER_MINECRAFT}-${VER_LOADER}/forge-${VER_MINECRAFT}-${VER_LOADER}-installer.jar
+    fi
+  else
+    echo "Minecraft version not set"
+    exit 1
+  fi
+
+  if [[ -n "$DL_URL" ]]; then
+    echo "$DL_URL"
+    rm -rf server.jar
+    curl -o forge-install.jar "${DL_URL}"
+    echo "$JAVA -jar forge-install.jar --installServer"
+    $JAVA -jar forge-install.jar --installServer
+
+    if [[ "$(printf '%s\n' "1.17.1" "$MC_VERSION" | sort -V | head -n1)" = "1.17.1" ]]; then
+      NEW_FORGE=true
+      rm -f forge-install.jar
+      rm -f forge-install.jar.log
+    else
+      NEW_FORGE=false
+      rm -f forge-install.jar
+      rm -f forge-install.jar.log
+      ln -s forge-"${VER_MINECRAFT}"-"${VER_LOADER}".jar server.jar
+    fi
+
+    touch server.properties
+  else
+    echo "No Valid Download URL"
+    crash
+  fi
+}

scripts/lib/loaders/neoforge.sh

@@ -0,0 +1,40 @@
+getNeoForge() {
+  SERVER_TYPE="NeoForge Server"
+
+  if [[ -n "$MC_VERSION" ]]; then
+    VER_MINECRAFT=$MC_VERSION
+    if [[ -n "${NEOFORGE_VERSION}" ]]; then
+      VER_LOADER="${NEOFORGE_VERSION}"
+    else
+      MC_MINOR="${MC_VERSION#1.}"
+      VER_LOADER=$(curl -s https://maven.neoforged.net/releases/net/neoforged/neoforge/maven-metadata.xml | \
+        xmllint --xpath "/metadata/versioning/versions/version/text()" - 2>/dev/null | \
+        tr ' ' '\n' | grep -v -- '-beta\|-alpha' | grep "^${MC_MINOR}\." | sort -V | tail -1)
+      if [[ -z "$VER_LOADER" ]]; then
+        echo "Could not auto-detect NeoForge version for MC ${MC_VERSION}"
+        crash
+      fi
+    fi
+    DL_URL=https://maven.neoforged.net/releases/net/neoforged/neoforge/$VER_LOADER/neoforge-$VER_LOADER-installer.jar
+  fi
+
+  if [[ -n "$DL_URL" ]]; then
+    echo "$DL_URL"
+    rm -rf server.jar
+
+    curl -o "neoforge-${VER_LOADER}-installer.jar" "${DL_URL}"
+    $JAVA -jar neoforge-$VER_LOADER-installer.jar --installServer --server.jar
+
+    mv server.jar neoforge-$VER_LOADER.jar
+    ln -s neoforge-$VER_LOADER.jar server.jar
+
+    touch server.properties
+
+    rm -f neoforge-$VER_LOADER-installer.jar
+    rm -f neoforge-$VER_LOADER-installer.jar.log
+    rm -f README.txt
+    rm -f run.bat
+  else
+    echo "No Valid Download URL"
+  fi
+}

scripts/lib/loaders/paper.sh

@@ -0,0 +1,23 @@
+getPaper() {
+  SERVER_TYPE="Paper Minecraft"
+  if [[ ! -f server.jar ]]; then
+    if [[ -n "${PAPER_BUILD}" ]]; then
+      LATEST_BUILD="${PAPER_BUILD}"
+    else
+      LATEST_BUILD=$(curl -s https://api.papermc.io/v2/projects/${MC_LOADER}/versions/${MC_VERSION}/builds |
+        jq -r '[.builds[] | select(.channel | ascii_upcase == "STABLE")] | .[-1].build')
+    fi
+
+    if [ "$LATEST_BUILD" != "null" ]; then
+      JAR_NAME=${MC_LOADER}-${MC_VERSION}-${LATEST_BUILD}.jar
+      PAPERMC_URL="https://api.papermc.io/v2/projects/${MC_LOADER}/versions/${MC_VERSION}/builds/${LATEST_BUILD}/downloads/${JAR_NAME}"
+
+      curl -o server.jar "$PAPERMC_URL"
+      echo "Download completed"
+      echo "Minecraft Version: ${MC_VERSION}"
+      echo "Paper Version: ${LATEST_BUILD}"
+    else
+      echo "No stable build for version $MC_VERSION found :("
+    fi
+  fi
+}

scripts/lib/loaders/vanilla.sh

@@ -0,0 +1,13 @@
+getVanilla() {
+  SERVER_TYPE="Vanilla Minecraft"
+  MANIFEST=$(curl -s https://launchermeta.mojang.com/mc/game/version_manifest.json)
+  VERSION_URL=$(echo "$MANIFEST" | jq -r ".versions[] | select(.id == \"${MC_VERSION}\") | .url")
+  if [[ -n "$VERSION_URL" ]] && [[ "$VERSION_URL" != "null" ]]; then
+    VERSION_DATA=$(curl -s "$VERSION_URL")
+    DOWNLOAD_URL=$(echo "$VERSION_DATA" | jq -r ".downloads.server.url")
+    curl -o server.jar "$DOWNLOAD_URL"
+  else
+    echo "Version ${MC_VERSION} not found in Mojang manifest"
+    crash
+  fi
+}