Add .prettierrc configuration

Add Prettier configuration file with YAML single quote override from click-compose.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: adamtheturtle

.prettierrc

@@ -0,0 +1,10 @@
+{
+  "overrides": [
+    {
+      "files": ["*.yaml", "*.yml"],
+      "options": {
+        "singleQuote": true
+      }
+    }
+  ]
+}

pyproject.toml

@@ -278,6 +278,7 @@ make-summary-multi-line = true
 
 ignore = [
     ".checkmake-config.ini",
+    ".prettierrc",
     ".yamlfmt",
     "*.enc",
     ".pre-commit-config.yaml",