Run oxfmt across repo, add format script and ignore config

Format all non-generated files with oxfmt via `vp fmt`. Add
.oxfmtignore to skip bindings/ and wasm-pack output. Add npm
format script and update DEVELOPMENT.md docs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/auth-basic/package.json

@@ -1,14 +1,14 @@
 {
   "name": "@yaak/auth-basic",
   "displayName": "Basic Authentication",
+  "version": "0.1.0",
+  "private": true,
   "description": "Authenticate requests using Basic Auth",
   "repository": {
     "type": "git",
     "url": "https://github.com/mountain-loop/yaak.git",
     "directory": "plugins/auth-basic"
   },
-  "private": true,
-  "version": "0.1.0",
   "scripts": {
     "build": "yaakcli build",
     "dev": "yaakcli dev",