Load pfUI through ClassicAPI's flavor TOCs

ClassicAPI redirects the read of pfUI\pfUI.toc to a flavored file whenever
the DLL is installed, so which TOC the client opens already answers whether
ClassicAPI is there. Split the manifest three ways and let that do the work:

  pfUI.toc             fallback, reached only when ClassicAPI is missing;
                       loads API_Check.lua and nothing else
  pfUI_ClassicAPI.toc  full addon, every non-Turtle client
  pfUI_Turtle.toc      full addon plus init\turtle.xml, on Turtle

The fallback TOC declares no SavedVariables. It used to, while API_Check.lua
reset pfUI_profiles to an empty table on the disabled path -- which truncated
the player's profiles on logout.

With the missing-DLL case handled by TOC selection, API_Check.lua drops the
null object stub that kept the other ~140 files quiet, along with
pfUI_disabled and the now unreachable early return in pfUI.lua. It keeps the
version gate, which still matters: the flavor redirect landed in ClassicAPI
v1.11.0, below the v1.13.1 pfUI needs, so an old DLL still gets served a
flavor TOC. pfUI.lua also loses a verbatim duplicate of the whole check.

Turtle-only files move to init\turtle.xml: modules\turtle-wow.lua (its
TURTLE_WOW_VERSION guard is now redundant) and the lft, turtle_shop,
barbershop, transmog and ebc skins. turtle-wow registers last instead of
75th of 84; the only ordering it relies on is pfUI.chat, registered 8th.

pfSellData moves to env\selldata.lua, listed only in pfUI_ClassicAPI.toc,
since turtle-wow.lua replaces the table wholesale on Turtle. env\tables.lua
keeps an empty declaration so sellvalue.lua has something to index when the
turtle-wow module is disabled.

The release workflow pinned PFUI_CLASSIC_API_LATEST in pfUI.lua, which has
not held that constant since it moved to API_Check.lua, so the pin was
silently doing nothing. It also switches to brues-code/packager@vCAPI, which
recognizes the _ClassicAPI and _Turtle suffixes and applies the TOC build
type filters to them.

pfUI.lua

@@ -3,8 +3,6 @@ function SlashCmdList.RELOAD(msg, editbox)
   ReloadUI()
 end
 
-if pfUI_disabled then return end
-
 local addonName = ...
 
 SLASH_PFUI1 = '/pfui'
@@ -23,73 +21,6 @@ pfUI:RegisterEvent("ADDON_LOADED")
 -- setup bootvar
 pfUI.bootup = true
 
-do
-  -- ClassicAPI dependency check.
-  -- pfUI relies pervasively on the modern C_* / SuperWoW / nameplate / focus
-  -- API surface that ClassicAPI polyfills, so presence is required.
-  local PFUI_CLASSIC_API_MIN     = 11301  -- (X*10000 + Y*100 + Z)
-  local PFUI_CLASSIC_API_LATEST  = PFUI_CLASSIC_API_MIN
-  local PFUI_CLASSIC_API_WEBSITE = "https://github.com/brues-code/ClassicAPI"
-  local PFUI_CLASSIC_API_LATEST_URL = PFUI_CLASSIC_API_WEBSITE .. "/releases/latest"
-  local function FormatVersion(packed)
-    local x = math.floor(packed / 10000)
-    local y = math.floor(math.mod(packed, 10000) / 100)
-    local z = math.mod(packed, 100)
-    return string.format("v%d.%d.%d", x, y, z)
-  end
-  if not CLASSIC_API_VERSION or CLASSIC_API_VERSION < PFUI_CLASSIC_API_MIN then
-    local minVersion = FormatVersion(PFUI_CLASSIC_API_MIN)
-    pfUI.disabled = true
-    local detail
-    if not CLASSIC_API_VERSION then
-      detail = "The ClassicAPI DLL isn't loaded. The |cff33ffcc!!!ClassicAPI|r addon ships bundled with it -- delete your |cff33ffcc!!!ClassicAPI|r folder and install the latest release from:"
-    else
-      detail = "ClassicAPI " .. minVersion .. " or newer is required. Delete your |cff33ffcc!!!ClassicAPI|r folder and reinstall the latest release from:"
-    end
-
-    local function ShowRequiredPopup()
-      StaticPopupDialogs["PFUI_CLASSICAPI_REQUIRED"] = {
-        text = "|cff33ffccpf|cffffffffUI|r has been disabled.\n\n" .. detail,
-        button1 = OKAY,
-        hasEditBox = 1,
-        editBoxWidth = 280,
-        timeout = 0,
-        whileDead = 1,
-        hideOnEscape = 1,
-        preferredIndex = 3,
-        OnShow = function()
-          local editBox = getglobal(this:GetName().."EditBox")
-          if editBox then
-            editBox:SetText(PFUI_CLASSIC_API_LATEST_URL)
-            editBox:HighlightText()
-            editBox:SetFocus()
-          end
-        end,
-      }
-      StaticPopup_Show("PFUI_CLASSICAPI_REQUIRED")
-      DEFAULT_CHAT_FRAME:AddMessage(
-        "|cff33ffccpf|cffffffffUI|r disabled: " .. detail .. " " .. PFUI_CLASSIC_API_LATEST_URL,
-        1, 0.3, 0.3
-      )
-    end
-    local loginFrame = CreateFrame("Frame")
-    loginFrame:RegisterEvent("PLAYER_ENTERING_WORLD")
-    loginFrame:SetScript("OnEvent", function()
-      loginFrame:UnregisterEvent("PLAYER_ENTERING_WORLD")
-      ShowRequiredPopup()
-    end)
-  elseif CLASSIC_API_VERSION < PFUI_CLASSIC_API_LATEST then
-    EventUtil.ContinueOnPlayerLogin(function()
-      C_Timer.After(8, function()
-        DEFAULT_CHAT_FRAME:AddMessage(
-          "|cff33ffccpf|rUI: ClassicAPI " .. FormatVersion(PFUI_CLASSIC_API_LATEST) .. " is available — " .. PFUI_CLASSIC_API_LATEST_URL,
-          1, 0.85, 0.3
-        )
-      end)
-    end)
-  end
-end
-
 pfUI_playerDB = pfUI_playerDB or {}
 pfUI_config = pfUI_config or {}
 pfUI_init = pfUI_init or {}