feat: wire up stuck-weapon follow-up for impale/slash specials

Add POST /api/combat/stuck-weapon-removal endpoint supporting three
removal types: attacker (weapon skill roll), self (STR+CON roll), and
first-aid (First Aid skill roll). After a special hit with damage
through, the attack result UI shows a stuck-weapon card with buttons
for each removal option.

TODO.md

@@ -3,7 +3,7 @@
 ## High priority (mechanics gaps)
 
 - [ ] Call `resolveHeadInjury()` in the attack handler when a Head hit penetrates armor
-- [ ] Resolve stuck-weapon follow-up after impale/slash special hits (`attemptWeaponRemoval`, `removeStuckWeaponFromSelf`, `removeStuckWeaponWithFirstAid`)
+- [x] Resolve stuck-weapon follow-up after impale/slash special hits (`attemptWeaponRemoval`, `removeStuckWeaponFromSelf`, `removeStuckWeaponWithFirstAid`)
 
 ## Medium priority (missing features)