chore: add prettier and format all files

- Install prettier ^3.6.2
- Add .prettierrc with project formatting rules
- Add .prettierignore to exclude generated files and dependencies
- Add npm scripts: format and format:check
- Format all files with prettier

.serena/memories/github_workflows_optimization_2025.md

@@ -139,7 +139,7 @@ check-ci:
 
 ### 2. Release Workflow (`release.yml`)
 
-- **Triggers**: tags (v*.*.*), manual dispatch
+- **Triggers**: tags (v*.*.\*), manual dispatch
 - **Jobs**: validate, check-ci, security, release
 - **Purpose**: Streamlined release process with CI dependency