character: durability % per inventory slot

Adds a Fizzle-style durability label to each character pane slot.
Renders at the bottom of the slot icon as "N%" colored by the existing
DURABILITY_THRESHOLD_COLORS table (red < orange < yellow < invasion <
green), or hidden when the item has no durability stat (necks, rings,
trinkets) or the slot is empty.

api/api.lua: new pfUI.api.CreateFontString(f, key, layer, size, flags,
font) helper following the CreateBackdrop pattern — idempotent
get-or-create that attaches the FontString to the parent frame as the
named field. Defaults to pfUI.font_default at C.global.font_size with
OUTLINE on the OVERLAY layer.

skins/blizzard/character.lua: scoreText migrated from the inline
"if not frame.scoreText then ..." block to the new helper as a working
example; new durabilityText created the same way at BOTTOM/size 10.
Durability render added to RefreshCharacterSlot — runs on every
PaperDollItemSlotButton_Update so equip/unequip/repair/damage all
refresh automatically.

api/config.lua + modules/gui.lua: new C.character.inventory.durability
toggle (default "1"). GUI lives under a new top-level "Character" tab
→ "Inventory" sub-tab, leaving room for future "Reputation" / "Skills"
sub-tabs at the same level.

api/api.lua

@@ -1167,6 +1167,26 @@ function pfUI.api.CreateBackdrop(f, inset, legacy, transp, backdropSetting)
   end
 end
 
+-- [ Create FontString ]
+-- Get-or-create a FontString attached to `f` as the named field. Idempotent —
+-- subsequent calls return the existing FontString. Defaults to pfUI's typical
+-- font style: default font at config size, OUTLINE flag, OVERLAY layer.
+-- 'f'      [frame]   parent frame
+-- 'key'    [string]  field name on `f` to stash the FontString (e.g. "scoreText")
+-- 'layer'  [string]  draw layer. Defaults to "OVERLAY".
+-- 'size'   [int]     font size. Defaults to C.global.font_size.
+-- 'flags'  [string]  font flags. Defaults to "OUTLINE".
+-- 'font'   [string]  font path. Defaults to pfUI.font_default.
+function pfUI.api.CreateFontString(f, key, layer, size, flags, font)
+  if not f or not key then return end
+  if f[key] then return f[key] end
+
+  local fs = f:CreateFontString(nil, layer or "OVERLAY")
+  fs:SetFont(font or pfUI.font_default, size or C.global.font_size, flags or "OUTLINE")
+  f[key] = fs
+  return fs
+end
+
 -- [ Create Shadow ]
 -- Creates a pfUI compatible frame as shadow element
 -- 'f'          [frame]         the frame which should get a backdrop.

api/config.lua

@@ -913,6 +913,8 @@ function pfUI:LoadConfig()
   pfUI:UpdateConfig("gm",         nil,           "server",           "elysium")
 
   pfUI:UpdateConfig("questlog",   nil,           "showQuestLevels",  "0")
+
+  pfUI:UpdateConfig("character",  "inventory",   "durability",       "1")
   pfUI:UpdateConfig("thirdparty", nil,           "chatbg",           "1")
   pfUI:UpdateConfig("thirdparty", nil,           "showmeter",        "0")
   pfUI:UpdateConfig("thirdparty", "dpsmate",     "skin",             "0")

modules/gui.lua

@@ -2393,6 +2393,10 @@ pfUI:RegisterModule("gui", function ()
       end)
     end
 
+    CreateGUIEntry(T["Character"], T["Inventory"], function()
+      CreateConfig(nil, T["Show Durability"], C.character.inventory, "durability", "checkbox")
+    end)
+
     CreateGUIEntry(T["Bags & Bank"], nil, function()
       CreateConfig(nil, T["Disable Item Quality Color For \"Common\" Items"], C.appearance.bags, "borderlimit", "checkbox")
       CreateConfig(nil, T["Enable Item Quality Color For Equipment Only"], C.appearance.bags, "borderonlygear", "checkbox")

skins/blizzard/character.lua

@@ -81,6 +81,14 @@ pfUI:RegisterSkin("Character", function ()
       "AmmoSlot"
     }
 
+    local DURABILITY_THRESHOLD_COLORS = {
+      RED_FONT_COLOR,
+      ORANGE_THREAT_COLOR,
+      YELLOW_FONT_COLOR,
+      INVASION_FONT_COLOR,
+      PURE_GREEN_COLOR,
+    }
+
     local function RefreshPetPosition()
       CharacterFrameTab3:ClearAllPoints()
       CharacterFrameTab3:SetPoint("LEFT", HasPetUI() and CharacterFrameTab2 or CharacterFrameTab1, "RIGHT", border*2 + 1, 0)
@@ -88,9 +96,9 @@ pfUI:RegisterSkin("Character", function ()
 
     local function RefreshCharacterSlot(slot)
       local slotId = slot:GetID()
-      local link = GetInventoryItemLink("player", slotId)
+      local itemID = GetInventoryItemID("player", slotId)
       if slot and slot.backdrop then
-        if link then
+        if itemID then
           local isBroken = GetInventoryItemBroken("player", slotId)
           local quality = GetInventoryItemQuality("player", slotId)
           if isBroken then
@@ -101,13 +109,31 @@ pfUI:RegisterSkin("Character", function ()
           else
             slot.backdrop:SetBackdropBorderColor(pfUI.cache.er, pfUI.cache.eg, pfUI.cache.eb, pfUI.cache.ea)
           end
+          if C.character.inventory.durability == "1" then
+            local current, maximum = GetInventoryItemDurability(slotId)
+            if current and maximum and maximum > 0 then
+              local pct = math.floor((current / maximum) * 100)
+              slot.durabilityText:SetText(pct .. "%")
+              -- 0-20% red, 20-40% orange, 40-60% yellow, 60-80% invasion, 80-100% green
+              local color = DURABILITY_THRESHOLD_COLORS[math.max(1, math.ceil(pct / 20))]
+              slot.durabilityText:SetTextColor(color:GetRGB())
+              slot.durabilityText:Show()
+            else
+              slot.durabilityText:SetText("")
+              slot.durabilityText:Hide()
+            end
+          else
+            slot.durabilityText:SetText("")
+            slot.durabilityText:Hide()
+          end
         else
           slot.backdrop:SetBackdropBorderColor(pfUI.cache.er, pfUI.cache.eg, pfUI.cache.eb, pfUI.cache.ea)
+          slot.durabilityText:SetText("")
+          slot.durabilityText:Hide()
         end
 
-        if ShaguScore and link then
-          local _, _, itemID = string.find(GetInventoryItemLink("player", slotId), "item:(%d+):%d+:%d+:%d+")
-          local itemLevel = ShaguScore.Database[tonumber(itemID)] or 0
+        if ShaguScore and itemID then
+          local itemLevel = C_Item.GetCurrentItemLevel({ equipmentSlotIndex = slotId })
           local _, _, quality, _, _, _, _, _, itemSlot, _ = GetItemInfo(itemID)
           local score = ShaguScore:Calculate(itemSlot, quality, itemLevel)
           if score and score > 0 and quality and quality > 0 then
@@ -174,11 +200,11 @@ pfUI:RegisterSkin("Character", function ()
 
       HandleIcon(frame.backdrop, _G["Character"..slotName.."IconTexture"])
 
-      if not frame.scoreText then
-        frame.scoreText = frame:CreateFontString(nil, "OVERLAY", "GameFontNormal")
-        frame.scoreText:SetFont(pfUI.font_default, 12, "OUTLINE")
-        frame.scoreText:SetPoint("TOPRIGHT", 0, 0)
-      end
+      CreateFontString(frame, "scoreText", "OVERLAY", 12)
+      frame.scoreText:SetPoint("TOPRIGHT", 0, 0)
+
+      CreateFontString(frame, "durabilityText", "OVERLAY", 10)
+      frame.durabilityText:SetPoint("BOTTOM", 0, 2)
     end
   end