ihasmail 2.0: rebuild as Stalwart-first JMAP webmail

Replace the FastAPI/HTMX prototype with a Node/Hono session proxy and a
React 19/Vite SPA. Mail (conversation view, search operators, labels,
sanitised HTML, privacy image proxy, invites, undo send, templates),
calendar (month/week/day/agenda, invites, free/busy, categories,
context menus), contacts (JSContact, groups, vCard), files, Sieve filter
builder (incl. filter-from-message with retroactive apply), vacation,
identities with default + Reply-To, PWA/mobile layout, push via SSE,
in-memory mock Stalwart for dev, Docker + CI.

package.json

@@ -0,0 +1,29 @@
+{
+  "name": "ihasmail",
+  "version": "2.0.0",
+  "private": true,
+  "description": "ihasmail \u2014 a fast, modern JMAP webmail for Stalwart Mail Server",
+  "license": "GPL-3.0-or-later",
+  "type": "module",
+  "workspaces": [
+    "server",
+    "web"
+  ],
+  "engines": {
+    "node": ">=20.10"
+  },
+  "scripts": {
+    "dev": "concurrently -n server,web -c blue,magenta \"npm run dev -w server\" \"npm run dev -w web\"",
+    "build": "npm run build -w web && npm run build -w server",
+    "start": "node server/dist/index.js",
+    "typecheck": "npm run typecheck -w web && npm run typecheck -w server",
+    "test": "npm run test -w web && npm run test -w server",
+    "lint": "npm run typecheck",
+    "mock": "npm run mock -w server",
+    "dev:mock": "concurrently -n mock,server,web -c yellow,blue,magenta \"npm run mock -w server\" \"STALWART_URL=http://127.0.0.1:8788 npm run dev -w server\" \"npm run dev -w web\""
+  },
+  "devDependencies": {
+    "concurrently": "^9.1.2",
+    "typescript": "^5.7.3"
+  }
+}