Paragon: give class 12 intrinsic AP and SP scaling from stats

Stock 3.3.5 hardcodes per-class stat -> AP/SP formulas in
Player::UpdateAttackPowerAndDamage and Unit::SpellBase{Damage,Healing}BonusDone,
so class 12 fell into the default branches and ended up with 0 AP and 0 SP
regardless of STR / AGI / INT / SPI. The character sheet, combat log, and
ability damage all reflected this, and Mental Quickness-style AP->SP plumbing
silently no-oped on Paragon characters.

Add Paragon-specific branches in core (no PlayerScript hooks - those caused
SIGSEGVs when the new mid-list enum entry shifted later hook ordinals and
broke vtable dispatch):

- StatSystem.cpp: melee and ranged AP = level*2 + STR + AGI - 20, mirroring
  the formula the UI patch already advertises in tooltips.
- Unit.cpp:       intrinsic SP    = level*2 + INT + SPI - 20 (clamped >=0),
  added symmetrically to SpellBaseDamageBonusDone and
  SpellBaseHealingBonusDone so the single advertised Spell Power value the
  character sheet renders matches what spells actually use in combat.

Drop the now-unused UnitDefines.h include in Paragon_SC.cpp - it was only
needed by the AP PlayerScript hook that was rolled back in favor of the
core change.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/server/game/Entities/Unit/Unit.cpp

@@ -9046,6 +9046,21 @@ int32 Unit::SpellBaseDamageBonusDone(SpellSchoolMask schoolMask)
         DoneAdvertisedBenefit += ToPlayer()->GetBaseSpellPowerBonus();
         DoneAdvertisedBenefit += ToPlayer()->GetBaseSpellDamageBonus();
 
+        // Fractured class 12 (Paragon) intrinsic spell power:
+        //   SP = level*2 + INT + SPI - 20 (clamped at 0)
+        // Read live from current stats so character-sheet refreshes (via
+        // UpdateSpellDamageAndHealingBonus) and live spell casts both see the
+        // up-to-date value with no script hooks or m_baseSpellPower mutation.
+        if (ToPlayer()->getClass() == CLASS_PARAGON)
+        {
+            int32 paragonSP = int32(GetLevel()) * 2
+                            + int32(GetStat(STAT_INTELLECT))
+                            + int32(GetStat(STAT_SPIRIT))
+                            - 20;
+            if (paragonSP > 0)
+                DoneAdvertisedBenefit += paragonSP;
+        }
+
         // Damage bonus from stats
         AuraEffectList const& mDamageDoneOfStatPercent = GetAuraEffectsByType(SPELL_AURA_MOD_SPELL_DAMAGE_OF_STAT_PERCENT);
         for (AuraEffectList::const_iterator i = mDamageDoneOfStatPercent.begin(); i != mDamageDoneOfStatPercent.end(); ++i)
@@ -9803,6 +9818,20 @@ int32 Unit::SpellBaseHealingBonusDone(SpellSchoolMask schoolMask)
         AdvertisedBenefit += ToPlayer()->GetBaseSpellPowerBonus();
         AdvertisedBenefit += ToPlayer()->GetBaseSpellHealingBonus();
 
+        // Fractured class 12 (Paragon) intrinsic spell power: same level*2 +
+        // INT + SPI - 20 floor as on the damage side (the character sheet
+        // shows a single Spell Power value, so both sides must add the same
+        // bonus).
+        if (ToPlayer()->getClass() == CLASS_PARAGON)
+        {
+            int32 paragonSP = int32(GetLevel()) * 2
+                            + int32(GetStat(STAT_INTELLECT))
+                            + int32(GetStat(STAT_SPIRIT))
+                            - 20;
+            if (paragonSP > 0)
+                AdvertisedBenefit += paragonSP;
+        }
+
         // Healing bonus from stats
         AuraEffectList const& mHealingDoneOfStatPercent = GetAuraEffectsByType(SPELL_AURA_MOD_SPELL_HEALING_OF_STAT_PERCENT);
         for (AuraEffectList::const_iterator i = mHealingDoneOfStatPercent.begin(); i != mHealingDoneOfStatPercent.end(); ++i)