Portal Gun

Implement only these approved requirements: - Register an inert ordinary custom item representing the Portal Gun, with no portal, teleportation, menu, keybind, or fuel behavior because those defining behaviors are unsupported. - Create a crafting_shaped recipe for the Portal Gun using 2 sticks and 2 iron ingots. The pattern, recipe ID, result item ID, result count, and category are unspecified; use a valid shaped arrangement, result count 1, and category misc. - Create the portal_gun texture: Pixel-art Minecraft inventory item texture for a sci-fi portal gun inspired by retro-futuristic cartoon technology: compact gray metal body, glowing green energy chamber, small blue accents, dark handle, clean readable silhouette, no text or logos.