v0.6.2 - Retour en onefile, suppression _internal

Changements :
- Retour a --onefile : exe unique, plus besoin de _internal/
- Le fix Zone.Identifier (v0.5.9) resout le probleme de DLL pour les exe telecharges
- Suppression de _internal/ du repo et ajout au .gitignore
- build.bat simplifie

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

_internal/_tcl_data/msgs/zh_tw.msg

@@ -1,8 +0,0 @@
-# created by tools/loadICU.tcl -- do not edit
-namespace eval ::tcl::clock {
-    ::msgcat::mcset zh_TW BCE "\u6c11\u570b\u524d"
-    ::msgcat::mcset zh_TW CE "\u6c11\u570b"
-    ::msgcat::mcset zh_TW DATE_FORMAT "%Y/%m/%e"
-    ::msgcat::mcset zh_TW TIME_FORMAT_12 "%P %I:%M:%S"
-    ::msgcat::mcset zh_TW DATE_TIME_FORMAT "%Y/%m/%e %P %I:%M:%S %z"
-}