Define Phosphor fluid simulation API for PHO-2#13
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This PR introduces the core fluid-physics API in phosphor-core with PhosphorWorld, Volume/VolumeBounds, FluidType, Solver, and EdgeForce abstractions. PhosphorWorld now supports spatial partitioning, fixed-timestep updates, interleaved solver passes, and edge-force transfer between adjacent volumes. Volume projects fluid state into a deterministic particle output so the particle system remains the render-facing representation. It also adds FluidSimulationTest coverage for fluid validation, adjacency transfer, partition lookup, fixed-step behavior, and particle derivation from fluid state, and ./gradlew jvmTest passes.