feat(auth): support API tokens and bearer token authentication

- Add backend services to create, list, and delete API tokens.
- Implement Bearer token authentication to resolve tokens to users.
- Register HTTP routes for managing user tokens under `/account/tokens`.
- Add tests to verify that uploads with valid Bearer tokens associate the upload with the correct user, while invalid tokens fall back to anonymous uploads.

backend/libs/handlers/accounts_test.go

@@ -67,6 +67,61 @@ func TestLoggedInUploadStoresOwnerAndAnonymousUploadDoesNot(t *testing.T) {
 	}
 }
 
+func TestBearerTokenUploadActsAsUser(t *testing.T) {
+	app, cleanup := newTestApp(t)
+	defer cleanup()
+
+	user, err := app.authService.CreateBootstrapUser("daniel", "daniel@example.test", "password123")
+	if err != nil {
+		t.Fatalf("CreateBootstrapUser returned error: %v", err)
+	}
+	tokenResult, err := app.authService.CreateAPIToken(user.ID, "cli")
+	if err != nil {
+		t.Fatalf("CreateAPIToken returned error: %v", err)
+	}
+
+	request := multipartUploadRequest(t, "/api/v1/upload", "file", "owned.txt", "owned")
+	request.Header.Set("Accept", "application/json")
+	request.Header.Set("Authorization", "Bearer "+tokenResult.Plaintext)
+	response := httptest.NewRecorder()
+	app.Upload(response, request)
+	if response.Code != http.StatusCreated {
+		t.Fatalf("token upload status = %d, body = %s", response.Code, response.Body.String())
+	}
+	var payload services.UploadResult
+	if err := json.Unmarshal(response.Body.Bytes(), &payload); err != nil {
+		t.Fatalf("json.Unmarshal returned error: %v", err)
+	}
+	box, err := app.uploadService.GetBox(payload.BoxID)
+	if err != nil {
+		t.Fatalf("GetBox returned error: %v", err)
+	}
+	if box.OwnerID != user.ID {
+		t.Fatalf("OwnerID = %q, want %q", box.OwnerID, user.ID)
+	}
+
+	// An invalid bearer token must not authenticate as the user.
+	badRequest := multipartUploadRequest(t, "/api/v1/upload", "file", "x.txt", "x")
+	badRequest.Header.Set("Accept", "application/json")
+	badRequest.Header.Set("Authorization", "Bearer wbx_bogus.secret")
+	badResponse := httptest.NewRecorder()
+	app.Upload(badResponse, badRequest)
+	if badResponse.Code != http.StatusCreated {
+		t.Fatalf("anonymous fallback upload status = %d, body = %s", badResponse.Code, badResponse.Body.String())
+	}
+	var badPayload services.UploadResult
+	if err := json.Unmarshal(badResponse.Body.Bytes(), &badPayload); err != nil {
+		t.Fatalf("json.Unmarshal returned error: %v", err)
+	}
+	badBox, err := app.uploadService.GetBox(badPayload.BoxID)
+	if err != nil {
+		t.Fatalf("GetBox returned error: %v", err)
+	}
+	if badBox.OwnerID != "" {
+		t.Fatalf("invalid token OwnerID = %q, want empty", badBox.OwnerID)
+	}
+}
+
 func TestInviteHandlerCreatesUserAndMarksInviteUsed(t *testing.T) {
 	app, cleanup := newTestApp(t)
 	defer cleanup()