fix(user): profile handler and main router updates

Minor adjustments to profile handler imports and main router configuration.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/main.go

@@ -56,7 +56,7 @@ func limitBody(limit int64) func(http.Handler) http.Handler {
 const (
 	defaultBodyLimit   int64 = 1 * 1024 * 1024  // 1MB
 	uploadBodyLimit    int64 = 15 * 1024 * 1024 // 15MB
-	portfolioBodyLimit int64 = 20 * 1024 * 1024 // 20MB
+	portfolioBodyLimit int64 = 40 * 1024 * 1024 // 40MB (7 variants from 20MB source)
 )
 
 func initDB() {