Replace tooltip-scanning GetSpellCost with ClassicAPI DBC reads

GetSpellCost now reads power cost and reagents straight from Spell.dbc via
C_Spell.GetSpellPowerCost (effective, talent-modified cost) and
C_Spell.GetSpellReagents (itemID), dropping the GameTooltip owner/scan
frames, their font strings, and all locale-dependent line parsing.

Reagent counting is now itemID-based end to end: GetReagentCount takes an
itemID and matches by id in the Items cache / bag scan. This removes the
hardcoded English reagent tables (_ReagentBySpell, _ReagentIdByName) and
the name-matching bag-scan tooltip, so it works on any client locale.
Verified in-game that GetSpellReagents covers DBC reagent spells (Vanish
-> Flash Powder), which the hand table previously special-cased.

The localized reagent name is still used for countedItemTypes registration
(recognizing a reagent item placed on the action bar); when that name
isn't cached yet, warm it via the ClassicAPI Item mixin
(Item:CreateFromItemID/ContinueOnItemLoad) and register it once it lands.

Extensions/Tooltip/Generic.lua

@@ -58,11 +58,7 @@ function CleveRoids.IndexSpells()
             bookType = CleveRoids.bookTypes[book]
             spells[bookType] = {}
         else
-            local cost, reagent = CleveRoids.GetSpellCost(i, bookType)
-            -- Fallback for known reagent spells if tooltip scan failed
-            if (not reagent or reagent == "") and CleveRoids.ReagentBySpell then
-                reagent = CleveRoids.ReagentBySpell[spellName]
-            end
+            local cost, reagent, reagentId = CleveRoids.GetSpellCost(i, bookType, spellId)
             if not spells[bookType][spellName] then
                 spells[bookType][spellName] = {
                     spellSlot = i,
@@ -71,7 +67,7 @@ function CleveRoids.IndexSpells()
                     bookType = bookType,
                     texture = texture,
                     cost = cost,
-                    reagent = reagent,
+                    reagentId = reagentId,
                 }
             end
             if spellRank and not spells[bookType][spellName][spellRank] then
@@ -83,7 +79,7 @@ function CleveRoids.IndexSpells()
                     bookType = bookType,
                     texture = texture,
                     cost = cost,
-                    reagent = reagent
+                    reagentId = reagentId,
                 }
                 spells[bookType][spellName].highest = spells[bookType][spellName][spellRank]
             end
@@ -94,6 +90,13 @@ function CleveRoids.IndexSpells()
 
             if reagent then
                 CleveRoids.countedItemTypes[reagent] = true
+            elseif reagentId and Item then
+                Item:CreateFromItemID(reagentId):ContinueOnItemLoad(function()
+                    local loadedName = C_Item.GetItemNameByID(reagentId)
+                    if loadedName and loadedName ~= "" then
+                        CleveRoids.countedItemTypes[loadedName] = true
+                    end
+                end)
             end
         end
     end