Add game_interfaces.hpp with five narrow domain contracts that GameHandler now
publishes to its domain handlers, replacing the previous friend-class anti-pattern.
Changes:
- include/game/game_interfaces.hpp (new): IConnectionState, ITargetingState,
IEntityAccess, ISocialState, IPvpState — each interface exposes only the state
its consumer legitimately needs
- include/game/game_handler.hpp: GameHandler inherits all five interfaces;
include of game_interfaces.hpp added
- include/game/movement_handler.hpp: remove `friend class GameHandler`; add
public named accessors for previously-private fields (monsterMovePacketsThisTickRef,
timeSinceLastMoveHeartbeatRef, resetMovementClock, setFalling, setFallStartMs)
- include/game/spell_handler.hpp: remove `friend class GameHandler/InventoryHandler/
CombatHandler/EntityController`; promote private packet handlers (handlePetSpells,
handleListStabledPets, pet stable commands, DBC loaders) to public; add accessor
methods for aura cache, known spells, and player aura slot mutation
- src/game/game_handler.cpp, game_handler_callbacks.cpp, game_handler_packets.cpp:
replace direct private field access with the new accessor API
(e.g. casting_ → isCasting(), monsterMovePacketsThisTick_ → ...ThisTickRef())
- src/game/inventory_handler.cpp, combat_handler.cpp, entity_controller.cpp:
replace friend-class private access with public accessor calls
No behaviour change. All 13 test suites pass. Zero build warnings.
