feat: add Prettier for consistent code formatting

- Add Prettier and eslint-config-prettier dependencies
- Configure Prettier with single quotes and 120-char line width
- Add format and check-format npm scripts
- Create .prettierignore to exclude build outputs and binaries
- Add .editorconfig for consistent IDE settings across team

Issue: CLDSRV-723

Author: Seragonia

.editorconfig

@@ -0,0 +1,19 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{js,mjs,json}]
+indent_size = 4
+
+[*.{md,yml,yaml}]
+indent_size = 2
+trim_trailing_whitespace = false
+
+[package.json]
+indent_size = 2

.prettierignore

@@ -0,0 +1,32 @@
+# Build outputs
+node_modules/
+dist/
+build/
+coverage/
+
+# Configuration files that should maintain their format
+package-lock.json
+yarn.lock
+*.log
+
+# Data directories
+localData/
+localMetadata/
+
+# Test artifacts
+artifacts/
+**/junit/
+
+# Binary files
+*.png
+*.jpg
+*.jpeg
+*.gif
+*.ico
+*.svg
+*.pdf
+
+# Generated or vendor files
+*.min.js
+*.min.css
+*.map 

.prettierrc

@@ -0,0 +1,13 @@
+{
+  "singleQuote": true,
+  "tabWidth": 4,
+  "useTabs": false,
+  "semi": true,
+  "trailingComma": "es5",
+  "bracketSpacing": true,
+  "arrowParens": "avoid",
+  "printWidth": 120,
+  "endOfLine": "lf",
+  "bracketSameLine": false,
+  "singleAttributePerLine": false
+}

package.json

@@ -56,8 +56,10 @@
     "@eslint/compat": "^1.2.2",
     "@scality/eslint-config-scality": "scality/Guidelines#8.3.0",
     "eslint": "^9.14.0",
+    "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-mocha": "^10.5.0",
+    "prettier": "^3.3.3",
     "express": "^4.21.1",
     "ioredis": "^5.4.1",
     "istanbul": "^0.4.5",
@@ -106,6 +108,8 @@
     "install_ft_deps": "yarn install [email protected] [email protected] [email protected] [email protected] [email protected]",
     "lint": "eslint $(git ls-files '*.js')",
     "lint_md": "mdlint $(git ls-files '*.md')",
+    "format": "prettier --write $(git ls-files '*.js' '*.mjs' '*.json' '*.md' '*.yml' '*.yaml')",
+    "check-format": "prettier --check $(git ls-files '*.js' '*.mjs' '*.json' '*.md' '*.yml' '*.yaml')",
     "mem_backend": "S3BACKEND=mem node index.js",
     "start": "npm-run-all --parallel start_dmd start_s3server",
     "start_mongo": "yarn run cloudserver",