mailu: full nox module — client, tools and events (ADR 0044/0046)

Email server. Users/aliases/domains over the admin REST API, mail read via
doveadm in the imap container; ten tools. Emits user/alias created/deleted by
polling and diffing the admin API, so a change in the web admin is announced
as readily as one via a tool. Consumes nothing — deliberately, since mutating
mail accounts off another module's event could silently lose mail. Typechecks
against the sdk; manifest parses.

Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF

modules/mailu/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@novox/module-mailu",
+  "version": "0.1.0",
+  "description": "mailu — mail server. Its API client, tools and events live here (novox/hq ADR 0044).",
+  "type": "module",
+  "private": true,
+  "dependencies": {
+    "@novox/mesh-sdk": "^0.1.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "typescript": "^5.6.0"
+  }
+}