feat: add sqlite-backed auth and library services

Bootstrap SQLite on server startup with embedded migrations and development seed data. Replace placeholder auth and library responses with database-backed services, bearer sessions, and repository-driven API handlers.

cmd/server/main.go

@@ -10,12 +10,29 @@ import (
 	"time"
 
 	"github.com/benya/temporserv/internal/config"
+	"github.com/benya/temporserv/internal/db"
 	"github.com/benya/temporserv/internal/httpapi"
 )
 
 func main() {
 	cfg := config.Load()
-	handler := httpapi.NewRouter(cfg)
+	ctx := context.Background()
+
+	database, err := db.Open(ctx, cfg)
+	if err != nil {
+		log.Fatalf("database bootstrap failed: %v", err)
+	}
+	defer database.Close()
+
+	if err := db.Migrate(ctx, database); err != nil {
+		log.Fatalf("database migrations failed: %v", err)
+	}
+
+	if err := db.Seed(ctx, database, cfg); err != nil {
+		log.Fatalf("database seed failed: %v", err)
+	}
+
+	handler := httpapi.NewRouter(cfg, database)
 
 	server := &http.Server{
 		Addr:              cfg.Address(),
@@ -41,4 +58,3 @@ func main() {
 		log.Printf("shutdown error: %v", err)
 	}
 }
-