v0.6.4 - Retour onedir (configuration stable)

Changements :
- Retour a --onedir : seule configuration sans erreur DLL confirmee
- _internal/ recommite dans le repo
- build.bat restaure avec copie automatique de _internal/

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

_internal/_tcl_data/tzdata/Asia/Singapore

@@ -0,0 +1,13 @@
+# created by tools/tclZIC.tcl - do not edit
+
+set TZData(:Asia/Singapore) {
+    {-9223372036854775808 24925 0 LMT}
+    {-2177477725 24925 0 SMT}
+    {-2038200925 25200 0 %z}
+    {-1167634800 26400 1 %z}
+    {-1073028000 26400 0 %z}
+    {-894180000 27000 0 %z}
+    {-879665400 32400 0 %z}
+    {-767005200 27000 0 %z}
+    {378662400 28800 0 %z}
+}