refactor routing into a modular and versioned structure

Move inline route definitions from main.go into a dedicated internal/routes package. This organization introduces support for API versioning (v1) and separates endpoint logic into specialized modules for administration and bug reporting.

internal/routes/routes.go

@@ -0,0 +1,22 @@
+package routes
+
+import (
+	"net/http"
+
+	v1 "emly-api-go/internal/routes/v1"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/jmoiron/sqlx"
+)
+
+// RegisterAll mounts every versioned API onto the root router.
+// To add a new API version, create internal/routes/v2 and add:
+//
+//	r.Mount("/v2", v2.NewRouter(db))
+func RegisterAll(r chi.Router, db *sqlx.DB) {
+	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("emly-api-go"))
+	})
+
+	r.Mount("/v1", v1.NewRouter(db))
+}