feat(backend): add About and Config controllers for dynamic environment variable retrieval

backend/internal/controllers/about.go

@@ -0,0 +1,19 @@
+package controllers
+
+import (
+	"backend/internal/utils"
+
+	"github.com/labstack/echo/v4"
+)
+
+func GetAbout(c echo.Context) error {
+
+	return utils.HTTPSuccessHandler(c, map[string]any{
+		"bg_url":  utils.GetEnv("about.bg_url"),
+		"content": utils.GetEnvMapString("about.content"),
+		"email":   utils.GetEnv("about.email"),
+		"name":    utils.GetEnv("about.name"),
+		"url":     utils.GetEnv("about.url"),
+		"avatar":  utils.GetEnv("about.avatar"),
+	})
+}

backend/internal/controllers/config.go

@@ -0,0 +1,17 @@
+package controllers
+
+import (
+	"backend/internal/utils"
+
+	"github.com/labstack/echo/v4"
+)
+
+func GetConfig(c echo.Context) error {
+	return utils.HTTPSuccessHandler(c, map[string]any{
+		"site_title":  utils.GetEnvMapString("site.title"),
+		"site_desc":   utils.GetEnvMapString("site.desc"),
+		"site_url":    utils.GetEnv("site.url"),
+		"site_icon":   utils.GetEnvWithDefault("site.icon", "/logo.png"),
+		"site_bg_url": utils.GetEnvWithDefault("site.bg_url", "https://img.fudaoyuan.icu/api/1/random/?scale_min=1.5&webp=true&md=false&format=302"),
+	})
+}

backend/internal/utils/env.go

@@ -44,3 +44,8 @@ func GetEnvWithDefault(key string, defaultValue string) string {
 	}
 	return value
 }
+
+func GetEnvMapString(key string) map[string]string {
+	InitEnv()
+	return v.GetStringMapString(key)
+}