Fix Android emulator API connectivity with cleaner build script approach

- Move Android-specific API server logic from common.sh to build-android.sh
- Remove unnecessary ANDROID_BUILD environment variable
- Set localhost:3000 as default in common.sh for all Capacitor builds
- Override to 10.0.2.2:3000 specifically in build-android.sh for Android development
- Fix execution order issue where common.sh ran before ANDROID_BUILD was set
- Maintain proper separation: Android emulator uses 10.0.2.2, iOS simulator uses localhost

capacitor.config.json

@@ -57,13 +57,14 @@
 		]
 	},
 	"android": {
-		"allowMixedContent": false,
+		"allowMixedContent": true,
 		"captureInput": true,
 		"webContentsDebuggingEnabled": false,
 		"allowNavigation": [
 			"*.timesafari.app",
 			"*.jsdelivr.net",
-			"api.endorser.ch"
+			"api.endorser.ch",
+			"10.0.2.2:3000"
 		]
 	},
 	"electron": {