feat(03-02): wire GET /api/inventory and GET /api/inventory/{id} routes

- NewRouter signature extended to accept *handlers.InventoryHandler
- GET /inventory and GET /inventory/{id} registered in /api route group
- main.go constructs handlers.NewInventoryHandler(nbClient) and passes to NewRouter

cmd/hwlab/main.go

@@ -77,7 +77,8 @@ func main() {
 		cfg.AI.QuickAddThreshold,
 	)
 
-	router := api.NewRouter(staticFS, intakeHandler)
+	inventoryHandler := handlers.NewInventoryHandler(nbClient)
+	router := api.NewRouter(staticFS, intakeHandler, inventoryHandler)
 	addr := fmt.Sprintf("%s:%d", cfg.Host, cfg.Port)
 	log.Printf("HWLab starting on %s", addr)
 

internal/api/router.go

@@ -33,7 +33,8 @@ func (h spaHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 // NewRouter creates the chi router. staticFiles is the fs.FS rooted at web/dist,
 // passed from main.go where the go:embed directive lives.
 // intakeHandler handles POST /api/intake (multipart photo upload).
-func NewRouter(staticFiles fs.FS, intakeHandler http.Handler) http.Handler {
+// inventoryHandler handles GET /api/inventory and GET /api/inventory/{id}.
+func NewRouter(staticFiles fs.FS, intakeHandler http.Handler, inventoryHandler *handlers.InventoryHandler) http.Handler {
 	r := chi.NewRouter()
 	r.Use(middleware.Logger)
 	r.Use(middleware.Recoverer)
@@ -42,6 +43,8 @@ func NewRouter(staticFiles fs.FS, intakeHandler http.Handler) http.Handler {
 	r.Route("/api", func(r chi.Router) {
 		r.Get("/health", handlers.Health)
 		r.Post("/intake", intakeHandler.ServeHTTP)
+		r.Get("/inventory", inventoryHandler.ListInventory)
+		r.Get("/inventory/{id}", inventoryHandler.GetInventoryItem)
 	})
 
 	// SPA fallback — serve static files; unknown paths fall back to index.html.