Fix compatibility with Factorio 2.1

[carmopereira]

Summary

The mod currently fails to load on the Factorio 2.1 experimental branch. This fixes the breaking API changes:

• LuaEntity.fluidbox / LuaFluidBox removed entirely — switched to LuaEntity.get_fluid / remove_fluid / fluids_count.
• defines.inventory.assembling_machine_input renamed to defines.inventory.crafter_input.
• RecipePrototype.category removed in favor of the categories array.
• LuaEntity.active is now read-only — replaced writes with disabled_by_script = true.
• data.raw.tool can be nil on a vanilla-only setup since 2.1 moved science packs off the tool/capsule item types; guarded the lookup in attack_proxy.lua.

info.json bumped to 2.0.3, factorio_version to 2.1, dependency to base >= 2.1.0.

Test plan

• Loaded the mod standalone under Factorio 2.1 experimental; all four load-time/runtime errors above were hit and fixed one at a time until the mod loaded and a depot could mine and order drones.
• Would appreciate a maintainer sanity-check on the fluid-depot behavior (mining depots that require fluid, e.g. uranium) since the old code paths there were rewritten.

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