Add Animations feature + fix own-pet tooltip false positive

Animations (all optional, default on, per-effect toggles):
- New Options -> Animations tab with master switch + per-effect checkboxes
- Embed PizzaSauce animation library (api/PizzaSauce.lua)
- fx-celebrate: firework + banner when a pet learns a new ability/rank,
  triggered from core-scan-beasttraining pet-learn hook
- Hunter's Book: slide + fade on open, results list fade on tab switch
- Options window: slide + fade on open
- All new user-facing strings keyed (ANIM_* namespace)

Fixes:
- Tooltip #19: own-pet lines (mood/loyalty/happiness/XP) no longer
  misfire on party members / targets. Removed the fragile title-name
  fallback in MTH_TT_IsTooltipOnOwnPet; ownership now requires positive
  unit identity.

Temp (remove before release): /mth fx and /mth fxdebug diagnostics.

init/api.xml

@@ -1,7 +1,9 @@
 <Ui xmlns="http://www.blizzard.com/wow/ui/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.blizzard.com/wow/ui/
 ..\FrameXML\UI.xsd">
+  <Include file="..\api\PizzaSauce.lua"/>
   <Include file="..\api\constants.lua"/>
   <Include file="..\api\savedvariables.lua"/>
+  <Include file="..\api\fx-celebrate.lua"/>
   <Include file="..\api\minimap-button.lua"/>
   <Include file="..\api\AutoStrip.xml"/>
   <Include file="..\api\AutoStrip.lua"/>
@@ -14,6 +16,7 @@
   <Include file="..\api\options.lua"/>
   <Include file="..\api\options-chronometer.lua"/>
   <Include file="..\api\options-credits.lua"/>
+  <Include file="..\api\options-animations.lua"/>
   <Include file="..\api\options-autobuy.lua"/>
   <Include file="..\api\options-autoquest.lua"/>
   <Include file="..\api\options-icu.lua"/>