feat: Playnite library sync plugin + exporter

A two-part Punktfunk plugin that syncs the Playnite library into the host
game library as the `playnite` provider:

- exporter/ — a minimal C# Playnite GenericPlugin ("Punktfunk Sync") that
  writes punktfunk-library.json on every library change. Reading Playnite's
  live-locked LiteDB from outside isn't robust, so this adapter runs inside
  Playnite. Builds net462 via reference assemblies; packaged as a .pext.
- src/ — the TS plugin (on @punktfunk/host, rom-manager shape): watches the
  export, embeds covers as data URLs, reconciles via
  PUT /library/provider/playnite, with a console-hosted web UI + standalone
  fallback + CLI. Launch = playnite://playnite/start/<id>, run by the host
  in the interactive session so Playnite performs the real launch.

Verified locally: backend tsc + 23 tests + biome clean, SPA build, C#
exporter build + .pext pack.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,55 @@
+{
+	"name": "@punktfunk/plugin-playnite",
+	"version": "0.1.0",
+	"private": false,
+	"type": "module",
+	"description": "Punktfunk plugin: syncs your Playnite library into the host game library as a provider — every store and emulator Playnite manages, launched back through Playnite, with a console-hosted web UI. Pairs with the bundled Playnite exporter extension.",
+	"license": "MIT OR Apache-2.0",
+	"homepage": "https://git.unom.io/unom/punktfunk-plugin-playnite",
+	"repository": {
+		"type": "git",
+		"url": "https://git.unom.io/unom/punktfunk-plugin-playnite.git"
+	},
+	"bugs": {
+		"url": "https://git.unom.io/unom/punktfunk-plugin-playnite/issues"
+	},
+	"keywords": [
+		"punktfunk",
+		"plugin",
+		"playnite",
+		"game-library",
+		"game-streaming"
+	],
+	"main": "./dist/index.js",
+	"module": "./dist/index.js",
+	"types": "./dist/index.d.ts",
+	"bin": {
+		"punktfunk-plugin-playnite": "./dist/cli.js"
+	},
+	"files": [
+		"dist"
+	],
+	"publishConfig": {
+		"registry": "https://git.unom.io/api/packages/unom/npm/"
+	},
+	"scripts": {
+		"typecheck": "tsc --noEmit",
+		"test": "bun test",
+		"build": "tsc -p tsconfig.build.json",
+		"build:ui": "cd ui && bun install --silent && bun run build",
+		"build:all": "bun run build && bun run build:ui",
+		"sync": "bun src/cli.ts sync",
+		"where": "bun src/cli.ts where",
+		"preview": "bun src/cli.ts preview",
+		"prepublishOnly": "bun run build:all"
+	},
+	"dependencies": {
+		"@punktfunk/host": "^0.1.1",
+		"effect": "^4.0.0-beta.98"
+	},
+	"devDependencies": {
+		"@biomejs/biome": "^2.5.2",
+		"@types/bun": "^1.3.0",
+		"typescript": "^5.9.3"
+	}
+}