Add external service config overrides + widget fix

- external-configs/: Chatwoot & Twenty custom compose files (shared DB)
- external-configs/: Widget show.html.erb (bypass broken Vite integration)
- .gitignore: exclude external source dirs, sensitive configs

.idea/vcs.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/chatwoot" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/twenty" vcs="Git" />
   </component>