use new PocketBaseClient in microblog package

internal/microblog/handler.go

@@ -1,6 +1,8 @@
 package microblog
 
 import (
+	"gemini_site/internal/pocketbase"
+
 	gemini "github.com/kulak/gemini"
 )
 
@@ -10,6 +12,6 @@ type Handler interface {
 }
 
 // NewHandler creates a new microblog handler
-func NewHandler() Handler {
-	return NewMicroBlog()
+func NewHandler(pbClient *pocketbase.PocketBaseClient) Handler {
+	return NewMicroBlog(pbClient)
 }