dev: add devcontainer

Author: Pfeil

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/java:25
+
+# Install Node.js LTS
+RUN curl -fsSL https://deb.nodesource.com/setup_24.x | bash - && \
+    apt-get install -y nodejs && \
+    rm -rf /var/lib/apt/lists/*
+RUN npm install -g ro-crate-html-js
+
+# Verify installations
+RUN node --version && npm --version

.devcontainer/devcontainer.json

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+{
+    "name": "Java (Gradle)",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "customizations": {
+        "zed": {
+            "extensions": ["java"]
+        }
+    },
+    "forwardPorts": [8080]
+}