Add prettier formatting and CI validation checks

- Add prettier with consistent formatting config
- Add format and format:check npm scripts
- Add prettier pre-commit hook
- Add validation and formatting checks to CI workflow
- Reformat all TypeScript and JSON files

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package-lock.json

@@ -15,6 +15,7 @@
       },
       "devDependencies": {
         "@types/node": "^22.18.6",
+        "prettier": "^3.7.2",
         "typescript": "^5.9.2"
       }
     },
@@ -2513,6 +2514,22 @@
         "node": ">=4"
       }
     },
+    "node_modules/prettier": {
+      "version": "3.7.2",
+      "resolved": "https://artifactory.infra.ant.dev:443/artifactory/api/npm/npm-all/prettier/-/prettier-3.7.2.tgz",
+      "integrity": "sha512-n3HV2J6QhItCXndGa3oMWvWFAgN1ibnS7R9mt6iokScBOC0Ul9/iZORmU2IWUMcyAQaMPjTlY3uT34TqocUxMA==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/proc-log": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/proc-log/-/proc-log-4.2.0.tgz",