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/options-credits.lua

@@ -129,7 +129,7 @@ function MTH_SetupCreditsOptions()
 
 	cursor = MTH_CreditsCreateText(content, cursor,
 		MTH_CR_L("CREDITS_ABOUT_ZHUNTER",
-		"- zBars, Antidaze and Autostrip were core functionalities of Vanilla zHunterMod addon. And I kept the \"z\" naming of bars/buttons to always remember it. On top of this I have created myself zAmmo, zCompanions, zMount, zToys.\nAlso the SmartAmmo feature idea is coming from Zhuntermod: there was a file in it with that functionality, but was like a work-in-progress, totally unfunctional and even \"dangerous\" in its current state, and was not active in the addon. Since it was a fucking great idea, I recoded it mostly from scratch and made it work reliably and safely."),
+		"- zBars, Antidaze and Autostrip were core functionalities of Vanilla zHunterMod addon. And I kept the \"z\" naming of bars/buttons to always remember it. On top of this I have created myself zBars, zAmmo, zCompanions, zMount, zToys, zCraft.\nAlso the SmartAmmo feature idea is coming from Zhuntermod: there was a file in it with that functionality, but was like a work-in-progress, totally unfunctional and even \"dangerous\" in its current state, and was not active in the addon. Since it was a fucking great idea, I recoded it mostly from scratch and made it work reliably and safely."),
 		"GameFontNormalSmall", -10)
 
 	cursor = MTH_CreditsCreateText(content, cursor,
@@ -170,7 +170,7 @@ function MTH_SetupCreditsOptions()
 		-4)
 
 	cursor = MTH_CreditsCreateText(content, cursor,
-		MTH_CR_L("CREDITS_ABOUT_MAP", "- The Map/Marker system is the one of pfQuest from Master Shagu. Unfortunately he is no more reachable for some months and I could not have some talk with him about this. I mostly let it untouched, I just made slight modifications so it can integrate better within Metahunt, and doesn't conflict with pfQuest."),
+		MTH_CR_L("CREDITS_ABOUT_MAP", "- The Map/Marker system is the one of pfQuest from Master Shagu. I mostly let it untouched, I just made slight modifications so it can integrate better within Metahunt, and doesn't conflict with pfQuest."),
 		"GameFontNormalSmall", -10)
 
 	cursor = MTH_CreditsCreateText(content, cursor,
@@ -179,8 +179,8 @@ function MTH_SetupCreditsOptions()
 
 	cursor = MTH_CreditsCreateText(content, cursor, MTH_CR_L("CREDITS_ABOUT_DATA_TITLE", "About data sources"), "GameFontNormal", -14, 1.00, 0.82, 0.00)
 	cursor = MTH_CreditsCreateText(content, cursor,
-		MTH_CR_L("CREDITS_ABOUT_DATA_INTRO", "Metahunt ships with its own Twow datastores, limited to hunter stuff only, and most of this data is up-to-date (Feb 2026).\n\n"
-		.. "Sources used to build the data include:"),
+		MTH_CR_L("CREDITS_ABOUT_DATA_INTRO", "Metahunt ships with its own Twow datastores, limited to hunter stuff only, and most of this data is up-to-date (twow 1.18.1). The beast information is coming directly from a extract of live twow DB, made for MetaHunt by twow dev lead in March 2026.\n\n"
+		.. "Other sources used to build the data include:"),
 		"GameFontNormalSmall", -10)
 
 	cursor = MTH_CreditsCreateText(content, cursor,