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/nb.msg

@@ -1,52 +0,0 @@
-# created by tools/loadICU.tcl -- do not edit
-namespace eval ::tcl::clock {
-    ::msgcat::mcset nb DAYS_OF_WEEK_ABBREV [list \
-        "s\u00f8"\
-        "ma"\
-        "ti"\
-        "on"\
-        "to"\
-        "fr"\
-        "l\u00f8"]
-    ::msgcat::mcset nb DAYS_OF_WEEK_FULL [list \
-        "s\u00f8ndag"\
-        "mandag"\
-        "tirsdag"\
-        "onsdag"\
-        "torsdag"\
-        "fredag"\
-        "l\u00f8rdag"]
-    ::msgcat::mcset nb MONTHS_ABBREV [list \
-        "jan"\
-        "feb"\
-        "mar"\
-        "apr"\
-        "mai"\
-        "jun"\
-        "jul"\
-        "aug"\
-        "sep"\
-        "okt"\
-        "nov"\
-        "des"\
-        ""]
-    ::msgcat::mcset nb MONTHS_FULL [list \
-        "januar"\
-        "februar"\
-        "mars"\
-        "april"\
-        "mai"\
-        "juni"\
-        "juli"\
-        "august"\
-        "september"\
-        "oktober"\
-        "november"\
-        "desember"\
-        ""]
-    ::msgcat::mcset nb BCE "f.Kr."
-    ::msgcat::mcset nb CE "e.Kr."
-    ::msgcat::mcset nb DATE_FORMAT "%e. %B %Y"
-    ::msgcat::mcset nb TIME_FORMAT "%H:%M:%S"
-    ::msgcat::mcset nb DATE_TIME_FORMAT "%e. %B %Y %H:%M:%S %z"
-}