feat(agents): Require gateway workspace root and main session key for agent provisioning

frontend/src/app/boards/[boardId]/edit/page.tsx

@@ -206,7 +206,7 @@ export default function EditBoardPage() {
               <Input
                 value={gatewayWorkspaceRoot}
                 onChange={(event) => setGatewayWorkspaceRoot(event.target.value)}
-                placeholder="~/.openclaw/workspaces"
+                placeholder="~/.openclaw"
                 disabled={isLoading}
               />
             </div>

frontend/src/app/boards/new/page.tsx

@@ -166,7 +166,7 @@ export default function NewBoardPage() {
               <Input
                 value={gatewayWorkspaceRoot}
                 onChange={(event) => setGatewayWorkspaceRoot(event.target.value)}
-                placeholder="~/.openclaw/workspaces"
+                placeholder="~/.openclaw"
                 disabled={isLoading}
               />
             </div>