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

src/config.ts

@@ -1,3 +1,24 @@
-export const API_BASE_URL =
-  (import.meta as any)?.env?.VITE_API_BASE_URL ||
-  'https://api.pennyzo.com/api/v1/general';
+// Environment detection
+const isDevelopment = import.meta.env.DEV;
+const isProduction = import.meta.env.PROD;
+
+// API Base URL configuration
+export const API_BASE_URL = 
+  import.meta.env.VITE_API_BASE_URL ||
+  (isDevelopment ? 'http://localhost:8000' : 'https://api.pennyzo.com/api/v1/general');
+
+// API Configuration
+export const API_CONFIG = {
+  BASE_URL: API_BASE_URL,
+  TIMEOUT: 30000, // 30 seconds
+  RETRY_ATTEMPTS: 3,
+  DEVELOPMENT_PORT: 8000,
+  PRODUCTION_URL: 'https://api.pennyzo.com/api/v1/general'
+};
+
+// Environment flags
+export const ENV = {
+  isDevelopment,
+  isProduction,
+  mode: import.meta.env.MODE || 'development'
+};