fix: remote proxy strips /api prefix causing remote Sencho to return SPA HTML

app.use('/api/', ...) causes Express to strip the '/api/' prefix from
req.url before http-proxy-middleware sees it, so the proxy was forwarding
'/stats' to the remote instead of '/api/stats'. The remote Sencho found
no matching route, fell through to its SPA catch-all, and returned
index.html (200 text/html) — explaining the SyntaxError on res.json().

Added pathRewrite: (path) => '/api' + path to restore the full path.
The connection test passed because testRemoteConnection calls the remote
directly via axios with the full URL, bypassing the proxy entirely.

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- **Fixed:** Remote node proxy stripping the `/api` path prefix — `remoteNodeProxy` is mounted at `app.use('/api/', ...)` so Express strips that prefix from `req.url` before `http-proxy-middleware` sees it; added `pathRewrite: (path) => '/api' + path` to restore the full path when forwarding to the remote Sencho instance (e.g. `/stats` → `/api/stats`). This was the root cause of all remote API calls returning the remote's SPA HTML instead of JSON.
 - **Fixed:** Dashboard cards (Active Containers, Host CPU, Host RAM, Docker Network) showing stale local-node data after switching to a remote node — `HomeDashboard` polling effects now depend on `activeNode?.id` and clear state immediately on node change.
 - **Fixed:** `refreshStacks` crashing with `SyntaxError` or `TypeError` when the remote proxy returns a non-JSON response (e.g., connection refused to unreachable remote node) — now checks `res.ok` before calling `res.json()` and iterates a typed `fileList` instead of the raw parsed value.
 - **Fixed:** Restored Local/Remote type selector and fixed state resets in the Add Node modal — form now resets to defaults every time the dialog opens, and the title reflects the chosen type dynamically.

backend/src/index.ts

@@ -331,6 +331,10 @@ const remoteNodeProxy = createProxyMiddleware<Request, Response>({
     const node = NodeRegistry.getInstance().getNode(req.nodeId);
     return node?.api_url?.replace(/\/$/, '');
   },
+  // When mounted at app.use('/api/', ...), Express strips the '/api/' prefix from
+  // req.url before the middleware sees it. Re-add it so the remote Sencho instance
+  // receives the full path (e.g. '/stats' becomes '/api/stats').
+  pathRewrite: (path) => '/api' + path,
   on: {
     proxyReq: (proxyReq, req) => {
       const node = NodeRegistry.getInstance().getNode(req.nodeId);