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>

config.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type RepoConfig struct {
+	Name string
+	URL  string
+	Path string
+}
+
+type SelfUpdateConfig struct {
+	URL     string
+	ExeName string
+	Branch  string
+}
+
+func loadConfig() ([]RepoConfig, SelfUpdateConfig, error) {
+	cfgPath := filepath.Join(exeDir(), "config.ini")
+	f, err := os.Open(cfgPath)
+	if err != nil {
+		return nil, SelfUpdateConfig{}, err
+	}
+	defer f.Close()
+
+	var repos []RepoConfig
+	var su SelfUpdateConfig
+	section := ""
+	kv := map[string]string{}
+
+	flush := func() {
+		switch {
+		case strings.HasPrefix(section, "repo:"):
+			name := strings.TrimPrefix(section, "repo:")
+			if kv["url"] != "" && kv["path"] != "" {
+				repos = append(repos, RepoConfig{
+					Name: name,
+					URL:  kv["url"],
+					Path: kv["path"],
+				})
+			}
+		case section == "self-update":
+			su.URL = strings.TrimRight(kv["url"], "/")
+			su.ExeName = kv["exe_name"]
+			if su.ExeName == "" {
+				su.ExeName = "GitUpdateChecker.exe"
+			}
+			su.Branch = kv["branch"]
+			if su.Branch == "" {
+				su.Branch = "master"
+			}
+		}
+		kv = map[string]string{}
+	}
+
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || strings.HasPrefix(line, ";") || strings.HasPrefix(line, "#") {
+			continue
+		}
+		if strings.HasPrefix(line, "[") && strings.HasSuffix(line, "]") {
+			flush()
+			section = strings.ToLower(strings.TrimSpace(line[1 : len(line)-1]))
+			continue
+		}
+		if idx := strings.IndexByte(line, '='); idx > 0 {
+			k := strings.TrimSpace(strings.ToLower(line[:idx]))
+			v := strings.TrimSpace(line[idx+1:])
+			kv[k] = v
+		}
+	}
+	flush()
+
+	return repos, su, scanner.Err()
+}