refactor(config): eliminate ErupeConfig global variable

Replace the mutable global `_config.ErupeConfig` with dependency
injection across 79 files. Config is now threaded through existing
paths: `ClientContext.RealClientMode` for packet encoding, `s.server.
erupeConfig` for channel handlers, and explicit parameters for utility
functions. This removes hidden coupling, enables test parallelism
without global save/restore, and prevents low-level packages from
reaching up to the config layer.

Key changes:
- Enrich ClientContext with RealClientMode for packet files
- Add mode parameter to CryptConn, mhfitem, mhfcourse functions
- Convert handlers_commands init() to lazy sync.Once initialization
- Delete global var, init(), and helper functions from config.go
- Update all tests to pass config explicitly

network/mhfpacket/msg_mhf_update_warehouse.go

@@ -35,7 +35,7 @@ func (m *MsgMhfUpdateWarehouse) Parse(bf *byteframe.ByteFrame, ctx *clientctx.Cl
 		case 0:
 			m.UpdatedItems = append(m.UpdatedItems, mhfitem.ReadWarehouseItem(bf))
 		case 1:
-			m.UpdatedEquipment = append(m.UpdatedEquipment, mhfitem.ReadWarehouseEquipment(bf))
+			m.UpdatedEquipment = append(m.UpdatedEquipment, mhfitem.ReadWarehouseEquipment(bf, ctx.RealClientMode))
 		}
 	}
 	return nil