v0.331.0: OnlyOffice opens and saves from FileBrowser and Nextcloud; FileBrowser back at once after a restart (R-1018)

FileBrowser config carries server.internalUrl http://filebrowser:80 (OnlyOffice fetched the public files address and got 403);
Nextcloud's DocumentServerInternalUrl gets its trailing slash (every save was lost: http://onlyoffice:80cache/...);
RestartStack("filebrowser") runs the R-1126 gate at once (files.<domain> was 502 for up to 5 min after the link switched).
Each red-proofed. MinAgent 0.158.1.

controller/README.md

@@ -3893,7 +3893,7 @@ CRUD methods in settings.go: `GetIntegrationState`, `SetIntegrationState`, `Remo
 #### Built-in Handlers
 
 **OnlyOffice → FileBrowser** (`onlyoffice_filebrowser.go`):
-- Apply: Reads `JWT_SECRET` + `SUBDOMAIN` from OnlyOffice app.yaml (decrypted), strips any existing `integrations:` block from FileBrowser `config.yaml` via `removeIntegrationsSection()`, appends new block with `url` (public HTTPS), `internalUrl` (`http://onlyoffice:80`), `secret`, `viewOnly: false`. Atomic write (`.tmp` + rename). Restarts FileBrowser
+- Apply: Reads `JWT_SECRET` + `SUBDOMAIN` from OnlyOffice app.yaml (decrypted), strips any existing `integrations:` block from FileBrowser `config.yaml` via `removeIntegrationsSection()`, appends new block with `url` (public HTTPS), `internalUrl` (`http://onlyoffice:80`), `secret`, `viewOnly: false`. Atomic write (`.tmp` + rename). Restarts FileBrowser — and `RestartStack("filebrowser")` runs the R-1126 gate at once, so files.<domain> is back within seconds (v0.331.0, R-1018). OnlyOffice fetches and saves the document at FileBrowser's `server.internalUrl` (`http://filebrowser:80`, rendered in every FileBrowser config since v0.331.0) — never through the public address
 - Revoke: Strips `integrations:` block from config.yaml, restarts FileBrowser
 
 **OnlyOffice → Nextcloud** (`onlyoffice_nextcloud.go`):
@@ -3901,7 +3901,7 @@ CRUD methods in settings.go: `GetIntegrationState`, `SetIntegrationState`, `Remo
   1. `app:install onlyoffice` (tolerates "already installed")
   2. `app:enable onlyoffice`
   3. `config:app:set onlyoffice DocumentServerUrl --value=https://{subdomain}.{domain}`
-  4. `config:app:set onlyoffice DocumentServerInternalUrl --value=http://onlyoffice:80`
+  4. `config:app:set onlyoffice DocumentServerInternalUrl --value=http://onlyoffice:80/` (the trailing slash is load-bearing: the connector appends paths — without it every save failed, v0.331.0, R-1018)
   5. `config:app:set onlyoffice jwt_secret --value={JWT_SECRET}`
   6. `config:app:set onlyoffice StorageUrl --value=http://nextcloud` (internal callback URL)
 - Revoke: Runs `occ app:disable onlyoffice` (tolerates container not running / app not enabled)