fix(dev): write VITE_BASE44_APP_BASE_URL instead of VITE_BASE44_BACKEND_URL in .env.local

VITE_BASE44_BACKEND_URL is only consumed by the vite plugin's legacy compat
shim (when legacySDKImports: true). The variable that actually enables the
Vite dev-server proxy (/api → local dev server) is VITE_BASE44_APP_BASE_URL,
as read by the plugin's non-sandbox config branch.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: yurynix

packages/cli/src/cli/commands/dev.ts

@@ -37,7 +37,7 @@ async function writeEnvLocalIfMissing(
   const { id: appId } = await initAppConfig();
   await writeFile(
     envLocalPath,
-    `VITE_BASE44_APP_ID=${appId}\nVITE_BASE44_BACKEND_URL=${localServerUrl(port)}\n`,
+    `VITE_BASE44_APP_ID=${appId}\nVITE_BASE44_APP_BASE_URL=${localServerUrl(port)}\n`,
   );
   log.info("Created .env.local with app ID and dev server URL");
 }

packages/cli/tests/cli/dev.spec.ts

@@ -47,14 +47,14 @@ describe("dev command", () => {
 
     const content = await t.readProjectFile(".env.local");
     expect(content).toContain(`VITE_BASE44_APP_ID=${t.api.appId}`);
-    expect(content).toContain("VITE_BASE44_BACKEND_URL=http://localhost:");
+    expect(content).toContain("VITE_BASE44_APP_BASE_URL=http://localhost:");
   });
 
   it("does not overwrite .env.local when it already exists", async () => {
     await t.givenLoggedInWithProject(fixture("full-project"));
 
     const existing =
-      "VITE_BASE44_APP_ID=existing-id\nVITE_BASE44_BACKEND_URL=http://localhost:9999\n";
+      "VITE_BASE44_APP_ID=existing-id\nVITE_BASE44_APP_BASE_URL=http://localhost:9999\n";
     await writeFile(join(t.getTempDir(), "project", ".env.local"), existing);
 
     const handle = await t.runLive("dev");