feat: add SQLite session store support

Add NewSQLiteSessionManager helper that creates an SCS session manager
backed by SQLite, allowing sessions to persist across server restarts.
The function handles table creation automatically.

internal/examples/session/main.go

@@ -1,13 +1,33 @@
 package main
 
 import (
+	"database/sql"
+	"log"
+
+	_ "github.com/mattn/go-sqlite3"
 	"github.com/ryanhamamura/via"
 	"github.com/ryanhamamura/via/h"
 )
 
 func main() {
+	// Open SQLite database for persistent sessions
+	db, err := sql.Open("sqlite3", "sessions.db")
+	if err != nil {
+		log.Fatalf("failed to open database: %v", err)
+	}
+	defer db.Close()
+
+	// Create session manager with SQLite store
+	sm, err := via.NewSQLiteSessionManager(db)
+	if err != nil {
+		log.Fatalf("failed to create session manager: %v", err)
+	}
+
 	v := via.New()
-	v.Config(via.Options{ServerAddress: ":7331"})
+	v.Config(via.Options{
+		ServerAddress:  ":7331",
+		SessionManager: sm,
+	})
 
 	// Login page
 	v.Page("/login", func(c *via.Context) {