feat(FN-3505): add node onboarding mapping flow with asset-gated bundling

- Add onboarding project-mapping API contracts and dashboard UI wiring in AddNodeModal/NodesView
- Persist node-to-project mappings with rollback-safe failure handling and expanded hook/API test coverage
- Document node onboarding mapping behavior in architecture and multi-project docs
- Add tsup bundle asset gates for openclaw bridge and droid runtime, with changesets and bundle output tests

Fusion-Task-Id: FN-3505

packages/dashboard/app/api-node.ts

@@ -3,9 +3,9 @@
  * All functions route through /api/proxy/:nodeId/... when a remote node is targeted.
  */
 
-import type { ProjectInfo } from "./api";
+import type { NodeProjectMappingInput, ProjectInfo } from "./api";
 import type { ProjectHealth, ProjectNodePathMapping, Task } from "@fusion/core";
-import { api, proxyApi } from "./api";
+import { api, proxyApi, upsertProjectPathMapping } from "./api";
 
 /** Health information for a remote node */
 export interface RemoteNodeHealth {
@@ -125,3 +125,13 @@ export async function syncNodeAuth(nodeId: string): Promise<NodeAuthSyncResult>
 export async function fetchNodeProjectPathMappings(nodeId: string): Promise<ProjectNodePathMapping[]> {
   return api<ProjectNodePathMapping[]>(`/nodes/${encodeURIComponent(nodeId)}/path-mappings`);
 }
+
+/** Persist one mapping per selected project for a newly-created node. */
+export async function persistNodeProjectPathMappings(
+  nodeId: string,
+  projectMappings: NodeProjectMappingInput[],
+): Promise<ProjectNodePathMapping[]> {
+  return Promise.all(
+    projectMappings.map(({ projectId, path }) => upsertProjectPathMapping(projectId, nodeId, path)),
+  );
+}