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).

api/AntiDaze.lua

@@ -10,10 +10,23 @@ local function AntiDaze_GetSaved()
 	if type(MTH_CharSavedVariables) ~= "table" then
 		MTH_CharSavedVariables = {}
 	end
-	if type(MTH_CharSavedVariables.antiDaze) ~= "table" then
-		MTH_CharSavedVariables.antiDaze = {}
+	local store
+	if MTH and MTH.GetModuleCharSavedVariables then
+		store = MTH:GetModuleCharSavedVariables("antidaze")
 	end
-	return MTH_CharSavedVariables.antiDaze
+	if type(store) ~= "table" then
+		if type(MTH_CharSavedVariables.modules) ~= "table" then
+			MTH_CharSavedVariables.modules = {}
+		end
+		if type(MTH_CharSavedVariables.modules.antidaze) ~= "table" then
+			MTH_CharSavedVariables.modules.antidaze = {}
+		end
+		store = MTH_CharSavedVariables.modules.antidaze
+	end
+	if type(store.settings) ~= "table" then
+		store.settings = {}
+	end
+	return store.settings
 end
 
 local function AntiDaze_IsEnabled()