feat(docker): add frontend service to docker-compose with env config improvements (#10536)

## Summary
This PR adds the frontend service to the Docker Compose configuration,
enabling `docker compose up` to run the complete stack including the
frontend. It also implements comprehensive environment variable
improvements and fixes Docker networking issues.

## Key Changes

### 🐳 Docker Compose Improvements
- **Added frontend service** to `docker-compose.yml` and
`docker-compose.platform.yml`
- **Production build**: Uses `pnpm build + serve` instead of dev server
for better stability and lower memory usage
- **Service dependencies**: Frontend now waits for backend services
(`rest_server`, `websocket_server`) to be ready
- **YAML anchors**: Implemented DRY configuration to avoid duplicating
environment values

### 🔧 Environment Variable Architecture
- **Dual environment strategy**: 
- Server-side code uses Docker service names
(`http://rest_server:8006/api`)
  - Client-side code uses localhost URLs (`http://localhost:8006/api`)
- **Comprehensive config**: Added build args and runtime environment
variables
- **Network compatibility**: Fixes connection issues between frontend
and backend containers

### 🛠️ Code Improvements
- **Centralized env-config helper** (`/frontend/src/lib/env-config.ts`)
with server-side priority
- **Updated all frontend code** to use shared environment helpers
instead of direct `process.env` access
- **Consistent API**: All environment variable access now goes through
helper functions

### 🔗 Files Changed
- `docker-compose.yml` & `docker-compose.platform.yml` - Added frontend
service
- `frontend/Dockerfile` - Added build args for environment variables
- `frontend/src/lib/env-config.ts` - New centralized environment
configuration
- Multiple frontend files - Updated to use env helpers

## Benefits
- ✅ **Single command deployment**: `docker compose up` now runs
everything
- ✅ **Better reliability**: Production build reduces memory usage and
crashes
- ✅ **Network compatibility**: Proper container-to-container
communication
- ✅ **Maintainable config**: Centralized environment variable management
- ✅ **Development friendly**: Works in both Docker and local development

## Testing
- ✅ Verified Docker service communication works correctly
- ✅ Frontend responds and serves content properly  
- ✅ Environment variables are correctly resolved in both server and
client contexts
- ✅ No connection errors after implementing service dependencies

🤖 Generated with [Claude Code](https://claude.ai/code)

---------

Co-authored-by: Claude <noreply@anthropic.com>

autogpt_platform/frontend/Dockerfile

@@ -15,6 +15,42 @@ CMD ["pnpm", "run", "dev", "--hostname", "0.0.0.0"]
 
 # Build stage for prod
 FROM base AS build
+# Accept build args for NEXT_PUBLIC_* variables
+ARG NEXT_PUBLIC_SUPABASE_URL
+ARG NEXT_PUBLIC_SUPABASE_ANON_KEY
+ARG NEXT_PUBLIC_AGPT_SERVER_URL
+ARG NEXT_PUBLIC_AGPT_WS_SERVER_URL
+ARG NEXT_PUBLIC_FRONTEND_BASE_URL
+ARG NEXT_PUBLIC_BEHAVE_AS
+ARG NEXT_PUBLIC_LAUNCHDARKLY_ENABLED
+ARG NEXT_PUBLIC_LAUNCHDARKLY_CLIENT_ID
+ARG NEXT_PUBLIC_APP_ENV
+ARG NEXT_PUBLIC_DEFAULT_LOCALE
+ARG NEXT_PUBLIC_LOCALES
+ARG NEXT_PUBLIC_SHOW_BILLING_PAGE
+ARG NEXT_PUBLIC_TURNSTILE
+ARG NEXT_PUBLIC_REACT_QUERY_DEVTOOL
+ARG NEXT_PUBLIC_GA_MEASUREMENT_ID
+ARG NEXT_PUBLIC_PW_TEST
+
+# Set environment variables from build args
+ENV NEXT_PUBLIC_SUPABASE_URL=$NEXT_PUBLIC_SUPABASE_URL
+ENV NEXT_PUBLIC_SUPABASE_ANON_KEY=$NEXT_PUBLIC_SUPABASE_ANON_KEY
+ENV NEXT_PUBLIC_AGPT_SERVER_URL=$NEXT_PUBLIC_AGPT_SERVER_URL
+ENV NEXT_PUBLIC_AGPT_WS_SERVER_URL=$NEXT_PUBLIC_AGPT_WS_SERVER_URL
+ENV NEXT_PUBLIC_FRONTEND_BASE_URL=$NEXT_PUBLIC_FRONTEND_BASE_URL
+ENV NEXT_PUBLIC_BEHAVE_AS=$NEXT_PUBLIC_BEHAVE_AS
+ENV NEXT_PUBLIC_LAUNCHDARKLY_ENABLED=$NEXT_PUBLIC_LAUNCHDARKLY_ENABLED
+ENV NEXT_PUBLIC_LAUNCHDARKLY_CLIENT_ID=$NEXT_PUBLIC_LAUNCHDARKLY_CLIENT_ID
+ENV NEXT_PUBLIC_APP_ENV=$NEXT_PUBLIC_APP_ENV
+ENV NEXT_PUBLIC_DEFAULT_LOCALE=$NEXT_PUBLIC_DEFAULT_LOCALE
+ENV NEXT_PUBLIC_LOCALES=$NEXT_PUBLIC_LOCALES
+ENV NEXT_PUBLIC_SHOW_BILLING_PAGE=$NEXT_PUBLIC_SHOW_BILLING_PAGE
+ENV NEXT_PUBLIC_TURNSTILE=$NEXT_PUBLIC_TURNSTILE
+ENV NEXT_PUBLIC_REACT_QUERY_DEVTOOL=$NEXT_PUBLIC_REACT_QUERY_DEVTOOL
+ENV NEXT_PUBLIC_GA_MEASUREMENT_ID=$NEXT_PUBLIC_GA_MEASUREMENT_ID
+ENV NEXT_PUBLIC_PW_TEST=$NEXT_PUBLIC_PW_TEST
+
 COPY autogpt_platform/frontend/ .
 ENV SKIP_STORYBOOK_TESTS=true
 RUN pnpm build