refactor: move IS_PLATFORM to config file for both frontend and backend

The reason we couldn't place it in shared/modelConstants.js is that the
frontend uses Vite which requires import.meta.env for environment variables,
while the backend uses process.env. Therefore, we created separate config files
for the frontend (src/constants/config.ts) and backend (server/constants/config.js).

server/constants/config.js

@@ -0,0 +1,5 @@
+/**
+ * Environment Flag: Is Platform
+ * Indicates if the app is running in Platform mode (hosted) or OSS mode (self-hosted)
+ */
+export const IS_PLATFORM = import.meta.env.VITE_IS_PLATFORM === 'true';

shared/modelConstants.js

@@ -62,11 +62,4 @@ export const CODEX_MODELS = {
   ],
 
   DEFAULT: 'gpt-5.2'
-};
-
-
-/**
- * Environment Flag: Is Platform
- * Indicates if the app is running in Platform mode (hosted) or OSS mode (self-hosted)
- */
-export const IS_PLATFORM = import.meta.env.VITE_IS_PLATFORM === 'true';
+};

src/components/LoginModal.jsx

@@ -1,6 +1,6 @@
 import { X } from 'lucide-react';
 import StandaloneShell from './StandaloneShell';
-import { IS_PLATFORM } from '../../shared/modelConstants';
+import { IS_PLATFORM } from '../constants/config';
 
 /**
  * Reusable login modal component for Claude, Cursor, and Codex CLI authentication

src/components/Onboarding.jsx

@@ -6,7 +6,7 @@ import CodexLogo from './CodexLogo';
 import LoginModal from './LoginModal';
 import { authenticatedFetch } from '../utils/api';
 import { useAuth } from '../contexts/AuthContext';
-import { IS_PLATFORM } from '../../shared/modelConstants';
+import { IS_PLATFORM } from '../constants/config';
 
 const Onboarding = ({ onComplete }) => {
   const [currentStep, setCurrentStep] = useState(0);

src/components/ProtectedRoute.jsx

@@ -4,7 +4,7 @@ import SetupForm from './SetupForm';
 import LoginForm from './LoginForm';
 import Onboarding from './Onboarding';
 import { MessageSquare } from 'lucide-react';
-import { IS_PLATFORM } from '../../shared/modelConstants';
+import { IS_PLATFORM } from '../constants/config';
 
 const LoadingScreen = () => (
   <div className="min-h-screen bg-background flex items-center justify-center p-4">

src/components/Shell.jsx

@@ -5,7 +5,7 @@ import { WebglAddon } from '@xterm/addon-webgl';
 import { WebLinksAddon } from '@xterm/addon-web-links';
 import '@xterm/xterm/css/xterm.css';
 import { useTranslation } from 'react-i18next';
-import { IS_PLATFORM } from '../../shared/modelConstants';
+import { IS_PLATFORM } from '../constants/config';
 
 const xtermStyles = `
   .xterm .xterm-screen {

src/components/Sidebar.jsx

@@ -16,7 +16,7 @@ import ProjectCreationWizard from './ProjectCreationWizard';
 import { api } from '../utils/api';
 import { useTaskMaster } from '../contexts/TaskMasterContext';
 import { useTasksSettings } from '../contexts/TasksSettingsContext';
-import { IS_PLATFORM } from '../../shared/modelConstants';
+import { IS_PLATFORM } from '../constants/config';
 
 // Move formatTimeAgo outside component to avoid recreation on every render
 const formatTimeAgo = (dateString, currentTime, t) => {

src/constants/config.ts

@@ -0,0 +1,5 @@
+/**
+ * Environment Flag: Is Platform
+ * Indicates if the app is running in Platform mode (hosted) or OSS mode (self-hosted)
+ */
+export const IS_PLATFORM = import.meta.env.VITE_IS_PLATFORM === 'true';

src/contexts/AuthContext.jsx

@@ -1,6 +1,6 @@
 import React, { createContext, useContext, useEffect, useState } from 'react';
 import { api } from '../utils/api';
-import { IS_PLATFORM } from '../../shared/modelConstants';
+import { IS_PLATFORM } from '../constants/config';
 
 const AuthContext = createContext({
   user: null,

src/contexts/WebSocketContext.tsx

@@ -1,6 +1,6 @@
 import { createContext, useContext, useEffect, useRef, useState } from 'react';
 import { useAuth } from './AuthContext';
-import { IS_PLATFORM } from '../../shared/modelConstants';
+import { IS_PLATFORM } from '../constants/config';
 
 type WebSocketContextType = {
   ws: WebSocket | null;