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/server.sh

@@ -0,0 +1,96 @@
+serverSelect() {
+  mkdir -p /data/server
+  cd /data/server || exit
+  if [[ -f "server.jar" ]] || [[ -f "run.sh" ]] || [[ -f "bedrock_server" ]]; then
+    echo "Found what appears to be a server, sending it"
+  else
+    case $MC_LOADER in
+    vanilla)
+      getVanilla
+      ;;
+    paper)
+      getPaper
+      ;;
+    fabric)
+      getFabric
+      ;;
+    forge)
+      getForge
+      ;;
+    neoforge)
+      getNeoForge
+      ;;
+    bedrock)
+      getBedrock
+      ;;
+    *)
+      echo "Server of type ${MC_LOADER} is not recognized."
+      crash
+      ;;
+    esac
+  fi
+}
+
+buildCommand() {
+  JAVA_ARGS="-Xms${XMS} -Xmx${XMX}"
+  if [[ -n $ADD_ARGS ]]; then
+    RUN_STRING="${ADD_ARGS} ${JAVA_ARGS} -jar ${JAR} nogui"
+  else
+    RUN_STRING="${JAVA_ARGS} -jar ${JAR} nogui"
+  fi
+}
+
+serverStart() {
+  while true; do
+    cd /data/server || exit
+    if [[ ! -f "server.properties" ]]; then touch "server.properties"; fi
+
+    if [[ -f $JAR || -f "run.sh" || -f "bedrock_server" ]]; then
+      echo -e "|_______________________________________________________|"
+      echo -e "|##----------------- Server Starting -----------------##|"
+      echo -e "|#| Minecraft Version: $MC_VERSION"
+      echo -e "|#| "
+      echo -e "|#| Loader Type: ${SERVER_TYPE:-$MC_LOADER}"
+      echo -e "|#| Loader Version: $MC_LOADER_VERSION"
+      echo -e "|#| "
+      if [[ "$MC_LOADER" != "bedrock" ]]; then
+        echo -e "|#| Java Version: $JAVA_VERSION"
+        echo -e "|#| Jar: $JAR"
+        echo -e "|#| Memory Allocated: "
+        echo -e "|#|    Xms: $XMS"
+        echo -e "|#|    Xmx: $XMX"
+        echo -e "|#| Additional Args: ${ADD_ARGS:-"NONE"}"
+      fi
+      echo -e "|#| "
+      echo -e "|#| Running as:"
+      echo -e "|#|    User:  $PUID"
+      echo -e "|#|    Group: $PGID"
+      echo -e "|#| "
+      if [[ "$MC_LOADER" == "bedrock" ]]; then
+        echo -e "|#| Run Command:"
+        echo -e "|#|    LD_LIBRARY_PATH=. ./bedrock_server"
+      elif [[ ${NEW_FORGE:-false} != "true" ]]; then
+        echo -e "|#| Run Command:"
+        echo -e "|#|    java $RUN_STRING"
+      fi
+      echo -e "|##---------------------------------------------------##|"
+      echo -e "|-------------------------------------------------------|"
+      echo -e " "
+      serverInfoWrite
+      newForge
+      if [[ "$MC_LOADER" == "bedrock" ]]; then
+        exec env LD_LIBRARY_PATH=. ./bedrock_server
+      elif [[ "$MC_LOADER" == "neoforge" ]]; then
+        exec java @user_jvm_args.txt @libraries/net/neoforged/neoforge/"${VER_LOADER}"/unix_args.txt "$@"
+      elif [[ "$MC_LOADER" == "forge" ]] && [[ ${NEW_FORGE:-false} == "true" ]]; then
+        exec java @user_jvm_args.txt @libraries/net/minecraftforge/forge/"$MC_VERSION"-"${VER_LOADER}"/unix_args.txt "$@"
+      else
+        echo "java $RUN_STRING"
+        exec java $RUN_STRING
+      fi
+    else
+      echo "Server Not Found."
+      crash
+    fi
+  done
+}