Unify SavedVariables into two clean roots with one-time migration

Collapse all legacy/scattered SavedVariables from absorbed standalone
addons (FeedOMatic, ZHunter/zButtons, SmartAmmo, AutoQuest, AntiDaze,
AutoStrip, MinimapButton) into two persisted globals with clean per-module
nesting under .modules.<id>.

Migration engine (api/savedvariables.lua):
- MTH_SV_EnsureSchema() with schemaVersion gate, idempotent + non-destructive
- Per-module migrators map old locations -> canonical nested stores
- Driven by an ADDON_LOADED("MetaHunt") handler so it runs only AFTER WoW
  loads the real SavedVariables (fixes announce-every-session bug that ran
  the migration on empty pre-load defaults)
- One-time player-facing chat announce, gated on real legacy data present

Framework/config:
- core-framework InitSavedVariables no longer runs migration at file-load;
  unconditionally strips account-root module aliases
- config.lua stops re-creating root[module] aliases (was duplicating data
  onto disk); canonical store stays under .modules.<id>

Modules:
- feedomatic: bind FOM_* globals as runtime aliases into nested store,
  drop persisted duplicates and .legacy blob
- zhunter: ZHunterMod_Saved re-pointed at .modules.zhunter
- smartammo/autoquest/antidaze/autostrip/minimapbutton read nested store

TOC trimmed to MTH_SavedVariables + MTH_CharSavedVariables only.
Profiles unchanged (already snapshot/apply the nested .modules structure).

Also includes pet-scan refinements: canonical pet key derivation and
level-independent pet signature (schema v3).

modules/tooltips/module.lua

@@ -115,23 +115,24 @@ local function MTH_TT_IsOwnPetTooltipsEnabled()
 end
 
 local function MTH_TT_GetAutoQuestStore()
-	if type(MTH_CharSavedVariables) ~= "table" then
-		return nil
-	end
-	local store = MTH_CharSavedVariables.autoquest
-	if type(store) ~= "table" then
-		store = MTH_CharSavedVariables.questautomation
+	local store = nil
+	if MTH and MTH.GetModuleCharSavedVariables then
+		store = MTH:GetModuleCharSavedVariables("autoquest")
 	end
 	if type(store) ~= "table" then
 		return nil
 	end
-	if store.scorpokDrazial == nil then
-		store.scorpokDrazial = false
+	if type(store.settings) ~= "table" then
+		store.settings = {}
 	end
-	if store.scorpokTooltip == nil then
-		store.scorpokTooltip = false
+	local settings = store.settings
+	if settings.scorpokDrazial == nil then
+		settings.scorpokDrazial = false
 	end
-	return store
+	if settings.scorpokTooltip == nil then
+		settings.scorpokTooltip = false
+	end
+	return settings
 end
 
 local function MTH_TT_IsScorpokAutomationEnabled()