Added javelins and enhanced NPC AI performance

Updated soldier logic: different combat modules are now used based on equipped weapons.
Added modules for long spear, javelin, one-handed sword, sword and shield, boxing, and unarmed combat.
Optimized the performance of NPC combat logic.
Removed hit stun animations and replaced them with reduced movement speed when taking damage.
Added limb damage for the player and corresponding injury effects.
Added the javelin weapon, which deals extremely high shield damage when thrown.
The next version will focus on fixing the katana, which currently has a bug that may prevent it from being drawn.
Simple update notes like this will be used from now on; no need for cover images to save time for feature development.