Fix Railway deployment for monorepo as single web service

This commit fixes the Railway build failure by:

1. **Root requirements.txt**: Added root-level requirements.txt that
   references backend/requirements.txt, enabling Railway's Nixpacks
   to auto-detect Python project and install dependencies correctly.
   Fixes "pip: not found" error.

2. **backend/__init__.py**: Created package init file to make backend
   a proper Python package, allowing uvicorn to import backend.app.main.

3. **railway.toml**: Simplified configuration for single-service
   monorepo deployment:
   - Uses NIXPACKS builder (auto-detects Python)
   - Starts with: uvicorn backend.app.main:app --host 0.0.0.0 --port $PORT
   - Health check at /health
   - Configured for app.blackroad.systems deployment

Technical details:
- Backend entrypoint: backend/app/main.py:app (FastAPI)
- Health endpoint: /health returns JSON with service status
- Frontend: BR-95 desktop UI served at / from backend/static/index.html
- API health: /api/health provides comprehensive integration status

Deployment target:
- Railway project: gregarious-wonder
- Service: BlackRoad-Operating-System
- Domain: app.blackroad.systems

railway.toml

@@ -1,80 +1,25 @@
 # ==============================================================================
-# ⚠️  CRITICAL WARNING - DO NOT USE THIS CONFIG IN PRODUCTION RAILWAY ⚠️
+# BlackRoad Operating System - Railway Configuration
 # ==============================================================================
 #
-# This railway.toml is for LOCAL DEVELOPMENT AND TESTING ONLY.
+# This configuration deploys the monorepo as a SINGLE web service to Railway.
 #
-# ❌ DO NOT add "BlackRoad-Operating-System" as a Railway service
-# ❌ DO NOT deploy this monorepo to production Railway environments
-# ❌ DO NOT add this repo to service configurations or env vars
+# Service: BlackRoad-Operating-System
+# Project: gregarious-wonder
+# Domain: app.blackroad.systems
 #
-# ✅ CORRECT DEPLOYMENT MODEL:
-#   - This repo is the SOURCE OF TRUTH (orchestration/sync only)
-#   - Deploy ONLY the satellite repos to Railway:
-#     • blackroad-os-core (from BlackRoad-OS/blackroad-os-core)
-#     • blackroad-os-api (from BlackRoad-OS/blackroad-os-api)
-#     • blackroad-os-operator (from BlackRoad-OS/blackroad-os-operator)
-#     • blackroad-os-prism-console (from BlackRoad-OS/blackroad-os-prism-console)
-#     • blackroad-os-docs (from BlackRoad-OS/blackroad-os-docs)
+# This is a temporary configuration. The long-term architecture uses satellite
+# repos (see DEPLOYMENT_ARCHITECTURE.md), but for now we're deploying the
+# monorepo directly to get the BR-95 desktop UI online.
 #
-# WHY THIS MATTERS:
-#   - Adding the monorepo to Railway will create circular deploy loops
-#   - Environment variables will break (wrong service URLs)
-#   - Cloudflare routing will fail
-#   - Service dependencies will be misconfigured
-#
-# See: docs/os/monorepo-sync.md and DEPLOYMENT_ARCHITECTURE.md
 # ==============================================================================
 
-# BlackRoad OS Monorepo - Railway Configuration
-# This configures multiple services from a single repository FOR LOCAL DEV ONLY
-
-# Backend (Core API)
-[[services]]
-name = "blackroad-backend"
-source = "backend"
-
-[services.build]
-builder = "DOCKERFILE"
-dockerfilePath = "backend/Dockerfile"
-
-[services.deploy]
-numReplicas = 1
-sleepApplication = false
-restartPolicyType = "ON_FAILURE"
-restartPolicyMaxRetries = 10
-
-[services.healthcheck]
-path = "/health"
-timeout = 10
-
-[[services.env]]
-name = "ENVIRONMENT"
-value = "production"
-
-[[services.env]]
-name = "DEBUG"
-value = "False"
-
-# Operator Engine (Job Scheduler & GitHub Automation)
-[[services]]
-name = "blackroad-operator"
-source = "operator_engine"
-
-[services.build]
+[build]
 builder = "NIXPACKS"
 
-[services.deploy]
-startCommand = "uvicorn operator_engine.server:app --host 0.0.0.0 --port $PORT"
-numReplicas = 1
-sleepApplication = false
+[deploy]
+startCommand = "uvicorn backend.app.main:app --host 0.0.0.0 --port $PORT"
+healthcheckPath = "/health"
+healthcheckTimeout = 100
 restartPolicyType = "ON_FAILURE"
 restartPolicyMaxRetries = 10
-
-[services.healthcheck]
-path = "/health"
-timeout = 10
-
-[[services.env]]
-name = "ENVIRONMENT"
-value = "production"