chore(release): add MIT license, bundle metadata, and single NSIS target

Phase 1 of the 0.1.0 release prep:
- LICENSE (MIT) plus license fields in Cargo.toml, package.json, and bundle config
- tauri.conf.json: publisher/copyright/descriptions/homepage so the NSIS
  installer no longer derives 'jezz' from the identifier as manufacturer
- version: null in tauri.conf.json — Cargo.toml is now the version source
- bundle.targets narrowed from 'all' to nsis (updater-friendly, faster builds)
- track pnpm-workspace.yaml (esbuild build-script approval, needed by CI)

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Phokus",
-  "version": "0.1.0",
+  "version": null,
   "identifier": "wtf.jezz.phokus",
   "build": {
     "beforeDevCommand": "pnpm dev:vite",
@@ -33,7 +33,13 @@
   },
   "bundle": {
     "active": true,
-    "targets": "all",
+    "targets": ["nsis"],
+    "publisher": "JezzWTF",
+    "license": "MIT",
+    "copyright": "Copyright © 2026 JezzWTF",
+    "shortDescription": "Local-first desktop media library",
+    "longDescription": "A local-first desktop media library for browsing, filtering, and curating image and video folders, with AI tagging, semantic search, and duplicate detection — all processed on-device.",
+    "homepage": "https://git.jezz.wtf/jezzwtf/phokus",
     "icon": [
       "icons/32x32.png",
       "icons/128x128.png",