Fix rSheet: remove space slug from URL paths

Space context comes from subdomain routing, not URL path segments.
Fix appUrl, externalApp.url, and onboardingActions.href to use
subdomain-compatible paths without {space} prefix.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/rsheet/mod.ts

@@ -21,7 +21,7 @@ routes.get("/", (c) => {
 			moduleId: "rsheet",
 			spaceSlug: space,
 			modules: getModuleInfoList(),
-			appUrl: `/${space}/rsheet/app`,
+			appUrl: `/rsheet/app`,
 			appName: "dSheet",
 			theme: "dark",
 		})
@@ -167,7 +167,7 @@ export const sheetModule: RSpaceModule = {
 	scoping: { defaultScope: "space", userConfigurable: false },
 	routes,
 	externalApp: {
-		url: "/modules/rsheet/app",
+		url: "/rsheet/app",
 		name: "dSheet",
 	},
 	outputPaths: [
@@ -184,7 +184,7 @@ export const sheetModule: RSpaceModule = {
 			icon: "\u{1F4CA}",
 			description: "Create or edit a collaborative spreadsheet",
 			type: "navigate" as any,
-			href: "/{space}/rsheet",
+			href: "/rsheet",
 		},
 	],
 };