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-external/httpsnippet/package.json

@@ -1,10 +1,9 @@
 {
   "name": "@yaak/httpsnippet",
-  "private": true,
-  "version": "1.0.3",
   "displayName": "HTTP Snippet",
+  "version": "1.0.3",
+  "private": true,
   "description": "Generate code snippets for HTTP requests in various languages and frameworks",
-  "minYaakVersion": "2026.2.0-beta.10",
   "repository": {
     "type": "git",
     "url": "https://github.com/mountain-loop/yaak.git",
@@ -20,5 +19,6 @@
   "devDependencies": {
     "@types/node": "^22.0.0",
     "typescript": "^5.9.3"
-  }
+  },
+  "minYaakVersion": "2026.2.0-beta.10"
 }