chore: optimize .editorconfig for consistent coding style

.editorconfig

@@ -1,7 +1,33 @@
+# .editorconfig for Railiance
+# See: https://editorconfig.org
+
 root = true
+
 [*]
+charset = utf-8
 end_of_line = lf
 insert_final_newline = true
-charset = utf-8
+trim_trailing_whitespace = true
+
+# Default indentation
 indent_style = space
 indent_size = 2
+
+# Markdown: don't strip trailing whitespace (needed for line breaks)
+[*.md]
+trim_trailing_whitespace = false
+
+# YAML & Ansible playbooks: 2 spaces
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+# Shell scripts: 2 spaces, LF enforced above
+[*.sh]
+indent_style = space
+indent_size = 2
+
+# Python: 4 spaces
+[*.py]
+indent_style = space
+indent_size = 4