Refactor site configuration and color scheme management

- Replaced static config with dynamic site info context.
- Updated color scheme handling in various components to use site info.
- Removed deprecated config file and integrated site info fetching.
- Enhanced user preference page to allow color scheme selection.
- Adjusted blog and console components to reflect new site info structure.
- Improved error handling and fallback mechanisms for site info retrieval.

internal/model/kv.go

@@ -1,5 +1,6 @@
-package main
-
-func main() {
+package model
 
+type KV struct {
+	Key   string `gorm:"primaryKey;type:varchar(64);not null;comment:键"`
+	Value JSONMap
 }