Enhance mini program environment configuration and chapter loading logic

- Introduced a debugging environment configuration in app.js, allowing for dynamic API endpoint selection based on the environment.
- Implemented lazy loading for chapter parts in chapters.js, improving performance by only fetching necessary data.
- Updated UI elements in chapters.wxml to reflect changes in chapter loading and added loading indicators.
- Enhanced error handling and data management for chapter retrieval, ensuring a smoother user experience.
- Added functionality for switching API environments in settings.js, visible only in development mode.

soul-api/internal/handler/search.go

@@ -37,6 +37,7 @@ func SearchGet(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{"success": true, "data": gin.H{"keyword": q, "total": 0, "results": []interface{}{}}})
 		return
 	}
+	sortChaptersByNaturalID(list)
 	lowerQ := strings.ToLower(q)
 	results := make([]gin.H, 0, len(list))
 	for _, ch := range list {