feat(vite-plugin-cloudflare): enable cross-process service bindings with dev registry (#9173)

* feat(miniflare): introduce getDefaultDevRegistryPath API

* feat(vite-plugin-cloudflare): enable dev registry

* fix(miniflare): adjust proxy style for better compatibility with wrangler

* chore(@fixture/dev-registry): add test fixture

* add changeset

* align fixture vitest config

* Update packages/vite-plugin-cloudflare/playground/multi-worker/__tests__/multi-worker.spec.ts

* Update packages/vite-plugin-cloudflare/src/miniflare-options.ts

---------

Co-authored-by: James Opstad <[email protected]>

Author: edmundhung

.changeset/bright-cloths-turn.md

@@ -0,0 +1,53 @@
+---
+"@cloudflare/vite-plugin": minor
+---
+
+Enable cross-process Service bindings and Tail workers with the Dev Registry
+
+You can now run workers in separate dev sessions—whether `vite dev` or `wrangler dev`—and they’ll automatically discover and connect to each other:
+
+**Worker A**
+
+```jsonc
+// ./worker-a/wrangler.jsonc
+{
+	"name": "worker-a",
+	"main": "./src/index.ts",
+	"services": [
+		{
+			"binding": "SERVICE",
+			"service": "worker-b",
+		},
+	],
+}
+```
+
+**Worker B**
+
+```jsonc
+// ./worker-b/wrangler.jsonc
+{
+	"name": "worker-b",
+	"main": "./src/index.ts",
+	"tail_consumers": [
+		{
+			"service": "worker-a",
+		},
+	],
+}
+```
+
+Then run both workers in separate terminals:
+
+```sh
+# Terminal 1
+cd worker-a
+vite dev
+
+# Terminal 2
+cd worker-b
+vite dev
+# or `wrangler dev` if you prefer
+```
+
+That's it!

.changeset/rich-nails-taste.md

@@ -0,0 +1,7 @@
+---
+"miniflare": minor
+---
+
+feat: export `getDefaultDevRegistryPath()` utility
+
+This provides a default XDG app-path for the Dev Registry, which can be used to set the `unsafeDevRegistryPath` option in Miniflare and will be used by both Wrangler and @cloudflare/vite-plugin.

fixtures/dev-registry/package.json

@@ -0,0 +1,21 @@
+{
+	"name": "@fixture/dev-registry",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"check:types": "tsc --build",
+		"test": "vitest",
+		"test:ci": "vitest run",
+		"vite": "vite dev",
+		"wrangler": "wrangler dev"
+	},
+	"devDependencies": {
+		"@cloudflare/vite-plugin": "workspace:*",
+		"@cloudflare/workers-tsconfig": "workspace:*",
+		"@cloudflare/workers-types": "^4.20250508.0",
+		"typescript": "catalog:default",
+		"vite": "catalog:vite-plugin",
+		"vitest": "catalog:default",
+		"wrangler": "workspace:*"
+	}
+}