Delete the Lua Carnage refresh

Carnage refreshes the caster's Rip and Rake when Ferocious Bite procs it, and
1.12 tells an observing caster nothing about it -- no packet carries a debuff's
new remaining duration on another unit. So this addon inferred the proc: track
every Ferocious Bite cast with its target, watch PLAYER_COMBO_POINTS for combo
points failing to drop to 0 within 0.5s, then rewrite the stored Rip and Rake
records and push the new durations into pfUI's tables by hand. Roughly 570 lines
across three files, and it could only ever be a guess, because the roll that
decides whether Carnage procs is server-side.

ClassicAPI does it in the DLL (src/turtle/Carnage.cpp), roll-gated, so
expirationTime is simply correct and there is nothing to infer.

Removed with it: ApplyCarnageRefresh, the Ferocious Bite cast tracking on both
the UNIT_CASTEVENT and nampower paths, the avoided-Bite clearing in the miss
handler, the Rip/Rake cast snapshots on the UNIT_CASTEVENT and SPELL_GO paths,
the Rake landed/failed verification hooks, the proc detector in
ComboPointTracker, and lastRipCast / lastRakeCast / RipSpellIDs / RakeSpellIDs,
which had no readers left afterwards.

carnageDurationOverrides goes too, and it never worked: every reference to it
was a write, a clear, or the 30-second sweep in Core.lua's cleanup. Nothing ever
read it to change a duration. FerociousBiteSpellIDs stays -- the combo-point
snapshot still needs to know a finisher when it sees one.

Core.lua

@@ -4260,20 +4260,6 @@ function CleveRoids.OnUpdate(self)
     if (time - CR.lastCleanupTime) >= CR.CLEANUP_INTERVAL then
         CR.lastCleanupTime = time
 
-        -- MEMORY: Clean up carnageDurationOverrides older than 30 seconds
-        -- PERFORMANCE: Use next() directly instead of pairs() to avoid iterator allocation
-        local carnageOverrides = CR.carnageDurationOverrides
-        if carnageOverrides then
-            local spellID, data = next(carnageOverrides)
-            while spellID do
-                local nextID = next(carnageOverrides, spellID)
-                if data.timestamp and (time - data.timestamp) > 30 then
-                    carnageOverrides[spellID] = nil
-                end
-                spellID, data = nextID, nextID and carnageOverrides[nextID]
-            end
-        end
-
         -- MEMORY: Clean up old ComboPointTracking entries (older than 60 seconds)
         -- PERFORMANCE: Use next() directly instead of pairs() to avoid iterator allocation
         local comboTracking = CR.ComboPointTracking