[Decomp][Player] Extract SpellCooldownMgr and PetMgr from Player.cpp

[r-log]

Ports the MangosTwo/MangosOne manager extractions to MangosZero (vanilla 1.12.x), mirroring mangostwo#234 and the mangosone managers PR. Lifts two cohesive concerns out of the Player god object into dedicated managers held by value on Player, with Player keeping its full public API as inline delegators so no external call site changes.

SpellCooldownMgr (SpellCooldownMgr.{h,cpp}) — owns the spell-cooldown map + its load/save/apply lifecycle. The SpellCooldown struct + SpellCooldowns typedef move to the manager header.

PetMgr (PetMgr.{h,cpp}) — owns the stable-slot count and the temporary-unsummon pet number. The Pet creature itself and the stable opcode handlers are untouched; they route through GetStableSlots()/SetStableSlots().

Mechanics: new XxxMgr with a Player* back-pointer; state + logic moved in with Player::→XxxMgr::, this→m_owner, member reads renamed; Player.h gets the include + a by-value member + inline delegators keeping the original method names/signatures; state members and out-of-line bodies removed from Player; ctor init-list gains m_spellCooldownMgr(this)/m_petMgr(this) in member-declaration order; direct readers that stay behind are rewired (SendInitialSpells → GetSpellCooldownMap(), NPCHandler stable code → GetStableSlots()/SetStableSlots()).

Vanilla bodies, not WotLK. Bodies are extracted from Zero's own Player:: code — e.g. PetMgr::UnsummonTemporaryIfAny keeps Zero's transport-passenger removal block; SpellCooldownMgr keeps the vanilla cat == 76 || cat == 351 ranged check and has no arena-cooldown method.

HonorMgr intentionally NOT ported. Vanilla honor is the classic contribution-point ranking system (m_honorCP list + m_honor_rank/m_highest_rank + m_rank_points/m_stored_honor/stored kills + AddHonorCP/UpdateHonor/_LoadHonorCP/_SaveHonorCP) — a different domain from the honor-points HonorMgr the siblings extracted (UpdateKills/Reward). Forcing that shape would be a redesign, not a port, so it is skipped (same expansion-delta category as Glyph/Rune managers being N/A here).

Built green with MSVC 2022 (game target), Eluna on and off.

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✅ Build Mangos ZERO Server 22.04.395-puwvdaso completed (commit 96dd657c06 by @r-log)