Fix API endpoint configuration with environment-aware URLs

- Add environment-based API URL configuration (dev: localhost:8000, prod: api.pennyzo.com)
- Update PennyzoApiService to use centralized config with timeout settings
- Fix API status checker scripts to load .env variables using dotenv
- Add environment management scripts (set-env.ps1) with npm shortcuts
- Create comprehensive configuration testing and validation tools
- Add TypeScript definitions for Vite environment variables
- Update all documentation with new environment configuration instructions
- Install dotenv package for Node.js environment variable loading
- All APIs now correctly use environment-appropriate URLs automatically

package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "axios": "^1.12.2",
         "chalk": "^4.1.2",
+        "dotenv": "^17.2.2",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "typescript": "^4.9.0"
@@ -1779,6 +1780,18 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/dotenv": {
+      "version": "17.2.2",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.2.2.tgz",
+      "integrity": "sha512-Sf2LSQP+bOlhKWWyhFsn0UsfdK/kCWRv1iuA2gXAwt3dyNabr6QSj00I2V10pidqz69soatm9ZwZvpQMTIOd5Q==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",