Generate a fully playable Minecraft...

Generate a fully playable Minecraft Java survival map inside a completely enclosed 50×50×50 cube. Players cannot break blocks or leave. Include a safe spawn with trees, grass, water, torches, animals, and a starter chest. Add compressed terrain with dirt, stone, sand, ores (coal, iron, gold, redstone, diamonds, obsidian), caves, lakes, and mini-structures with loot. Include mob spawns, farms, lighting, hidden treasures, and an End portal with Eyes of Ender. Ensure survival progression from spawn to defeating the Ender Dragon is possible. Provide detailed, layer-by-layer instructions using only blocks available in Java edition, with no command blocks or text commands."