feature/go-rewrite : base Go avec walk GUI

- Rewrite complet en Go : exe unique sans _internal/, sans extraction temp
- GUI Windows-native via github.com/lxn/walk (TableView, TextEdit, PushButton)
- Meme fonctionnalites : check repos, pull, checkout, auto-update, logs
- build.bat : go build -ldflags "-H windowsgui -s -w" -> 9.6 Mo, zero dependance

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

_internal/_tcl_data/msgs/tr.msg

@@ -1,50 +0,0 @@
-# created by tools/loadICU.tcl -- do not edit
-namespace eval ::tcl::clock {
-    ::msgcat::mcset tr DAYS_OF_WEEK_ABBREV [list \
-        "Paz"\
-        "Pzt"\
-        "Sal"\
-        "\u00c7ar"\
-        "Per"\
-        "Cum"\
-        "Cmt"]
-    ::msgcat::mcset tr DAYS_OF_WEEK_FULL [list \
-        "Pazar"\
-        "Pazartesi"\
-        "Sal\u0131"\
-        "\u00c7ar\u015famba"\
-        "Per\u015fembe"\
-        "Cuma"\
-        "Cumartesi"]
-    ::msgcat::mcset tr MONTHS_ABBREV [list \
-        "Oca"\
-        "\u015eub"\
-        "Mar"\
-        "Nis"\
-        "May"\
-        "Haz"\
-        "Tem"\
-        "A\u011fu"\
-        "Eyl"\
-        "Eki"\
-        "Kas"\
-        "Ara"\
-        ""]
-    ::msgcat::mcset tr MONTHS_FULL [list \
-        "Ocak"\
-        "\u015eubat"\
-        "Mart"\
-        "Nisan"\
-        "May\u0131s"\
-        "Haziran"\
-        "Temmuz"\
-        "A\u011fustos"\
-        "Eyl\u00fcl"\
-        "Ekim"\
-        "Kas\u0131m"\
-        "Aral\u0131k"\
-        ""]
-    ::msgcat::mcset tr DATE_FORMAT "%d.%m.%Y"
-    ::msgcat::mcset tr TIME_FORMAT "%H:%M:%S"
-    ::msgcat::mcset tr DATE_TIME_FORMAT "%d.%m.%Y %H:%M:%S %z"
-}