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>

vite.config.ts

@@ -1,16 +1,16 @@
-import { defineConfig } from 'vite-plus';
+import { defineConfig } from "vite-plus";
 
 export default defineConfig({
   lint: {
-    ignorePatterns: ['npm/**', 'crates/yaak-templates/pkg/**', '**/bindings/gen_*.ts'],
+    ignorePatterns: ["npm/**", "crates/yaak-templates/pkg/**", "**/bindings/gen_*.ts"],
     options: {
       typeAware: true,
     },
     rules: {
-      'typescript/no-explicit-any': 'error',
+      "typescript/no-explicit-any": "error",
     },
   },
   test: {
-    exclude: ['**/node_modules/**', '**/flatpak/**'],
+    exclude: ["**/node_modules/**", "**/flatpak/**"],
   },
 });