Fix Render deployment TypeScript build errors

**Problem**: Render builds failed because TypeScript dependencies were in devDependencies,
which aren't installed in NODE_ENV=production builds.

**Solutions**:
- Move TypeScript and @types/* packages to dependencies for production builds
- Update tsconfig.json to only include production source files (exclude test files)
- Ensures clean production builds without test/vitest dependencies

**Fixed errors**:
- Cannot find module 'vitest'
- Could not find declaration files for express, cors, body-parser
- Implicit 'any' type errors

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

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

Author: robdimarco-atxp

backend/package.json

@@ -17,19 +17,19 @@
     "body-parser": "^1.20.2",
     "cors": "^2.8.5",
     "dotenv": "^16.3.1",
-    "express": "^4.18.2"
-  },
-  "devDependencies": {
+    "express": "^4.18.2",
     "@types/body-parser": "^1.19.2",
     "@types/cors": "^2.8.13",
     "@types/express": "^4.17.17",
     "@types/node": "^20.19.13",
+    "typescript": "^4.9.5"
+  },
+  "devDependencies": {
     "@types/supertest": "^6.0.3",
     "@vitest/ui": "^3.2.4",
     "nodemon": "^3.0.2",
     "supertest": "^7.1.4",
     "ts-node": "^10.9.0",
-    "typescript": "^4.9.5",
     "vitest": "^3.2.4"
   }
 }

backend/tsconfig.json

@@ -15,7 +15,9 @@
     "sourceMap": true
   },
   "include": [
-    "*.ts"
+    "server.ts",
+    "stage.ts", 
+    "atxp-utils.ts"
   ],
   "exclude": [
     "node_modules",