Add boot image management with ISO extraction and serving

Upload Proxmox ISOs via API or dashboard UI, extract kernel+initrd
using pure-Go iso9660 library, store on disk, and serve over HTTP
for PXE booting. Dynamic kernel/initrd filenames per image replace
the previous hardcoded paths.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/api/smoke_test.go

@@ -16,6 +16,7 @@ import (
 	"provisioning/internal/db"
 	"provisioning/internal/events"
 	"provisioning/internal/httpserver"
+	"provisioning/internal/image"
 	"provisioning/internal/model"
 	"provisioning/internal/orchestrator"
 	"provisioning/internal/pxe"
@@ -39,6 +40,10 @@ func newTestServer(t *testing.T) *httptest.Server {
 	hub := events.NewHub()
 	t.Cleanup(func() { hub.Shutdown(context.Background()) })
 
+	imageDir := filepath.Join(tmp, "images")
+	os.MkdirAll(imageDir, 0o755)
+	imageSvc := &image.Service{Store: images, ImageDir: imageDir}
+
 	cfg := &config.Config{
 		Server: config.Server{
 			Bind:      "127.0.0.1:0",
@@ -68,6 +73,8 @@ func newTestServer(t *testing.T) *httptest.Server {
 		ServerTypes: serverTypes,
 	}
 
+	imageAPI := &api.ImageAPI{Svc: imageSvc}
+
 	hostAPI := &api.HostAPI{
 		Hosts:        hosts,
 		Ops:          ops,
@@ -94,6 +101,7 @@ func newTestServer(t *testing.T) *httptest.Server {
 		Ops:          ops,
 		Locks:        locks,
 		Images:       images,
+		ImageSvc:     imageSvc,
 		Runner:       runner,
 		Orchestrator: hostOrch,
 		Hub:          hub,
@@ -103,10 +111,12 @@ func newTestServer(t *testing.T) *httptest.Server {
 	}
 
 	router := httpserver.NewRouter(httpserver.Deps{
-		HostAPI: hostAPI,
-		BootAPI: bootAPI,
-		UI:      ui,
-		Hub:     hub,
+		HostAPI:  hostAPI,
+		BootAPI:  bootAPI,
+		ImageAPI: imageAPI,
+		UI:       ui,
+		Hub:      hub,
+		ImageDir: imageDir,
 	})
 
 	return httptest.NewServer(router)