feat: Phase 1 — 项目骨架搭建，集成 Gin、SQLite 和设置页面

config/config.go

@@ -0,0 +1,39 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+)
+
+type Config struct {
+	Port    string
+	GinMode string
+	DataDir string
+}
+
+func Load() *Config {
+	cfg := &Config{
+		Port:    getEnv("PORT", "8080"),
+		GinMode: getEnv("GIN_MODE", "debug"),
+		DataDir: getEnv("DATA_DIR", "data"),
+	}
+	// Ensure data directories exist
+	os.MkdirAll(cfg.DataDir, 0o755)
+	os.MkdirAll(filepath.Join(cfg.DataDir, "repos"), 0o755)
+	return cfg
+}
+
+func (c *Config) DBPath() string {
+	return filepath.Join(c.DataDir, "pr-helper.db")
+}
+
+func (c *Config) ReposDir() string {
+	return filepath.Join(c.DataDir, "repos")
+}
+
+func getEnv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}