fix: correct HMR config for SSL proxy and fix define block bugs

- Fixed HMR to use WSS when behind SSL proxy
- Fixed define block - values now properly JSON.stringify'd
- Changed server.host to '0.0.0.0' for proper container binding
- Created .env.development for automatic env loading
- Uses loadEnv() to properly load environment files

.env.development

@@ -0,0 +1,18 @@
+PORT_FRONTEND=5173
+PORT_FRONTEND_HMR=3002
+PORT_API=800
+PORT_SUPABASE=8000
+
+HOST_FRONTEND=localhost:5173
+VITE_PORT_FRONTEND=5173
+VITE_PORT_FRONTEND_HMR=5173
+
+VITE_APP_NAME=Classroom Copilot
+VITE_SUPER_ADMIN_EMAIL=[email protected]
+VITE_DEV=true
+VITE_FRONTEND_SITE_URL=http://localhost:5173
+VITE_APP_HMR_URL=http://localhost:5173
+VITE_SUPABASE_URL=http://localhost:8000
+VITE_SUPABASE_ANON_KEY=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJhdXRoZW50aWNhdGVkIiwiaWF0IjoxNzcxNzAwMTAwLCJpc3MiOiJzdXBhYmFzZSIsInN1YiI6IjAwMDAwMDAwLTAwMDAtMDAwMC0wMDAwLTAwMDAwMDAwMDAwMCIsImV4cCI6MjA4NzA2MDEwMCwicm9sZSI6ImFub24ifQ.-ZIBd7I6DeBgIlj_JJMvrvPqvdrQAMDuOvp-zddDsmc
+VITE_API_URL=http://localhost:8080
+VITE_API_BASE=http://localhost:8080