feat(ios): add fastlane setup

apps/ios/fastlane/.env.example

@@ -0,0 +1,13 @@
+# App Store Connect API key (pick one approach)
+#
+# Recommended:
+# APP_STORE_CONNECT_API_KEY_PATH=/absolute/path/to/AuthKey_XXXXXX.json
+#
+# Or:
+# ASC_KEY_ID=XXXXXXXXXX
+# ASC_ISSUER_ID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+# ASC_KEY_CONTENT=BASE64_P8_CONTENT
+
+# Deliver toggles (off by default)
+# DELIVER_METADATA=1
+# DELIVER_SCREENSHOTS=1