Merge main via the stage-display branch: data dir, installer, versioning

Adopts the new contract: the manifest declares "proddash": ">=1.2.0"
(this module's admin device picker needs the optionsRoute select support
this branch adds), module version 1.2.0, and the shell version bumps
1.1.0 → 1.2.0 for that admin capability. The optionsRoute paragraph
merged into the guide's new schema section cleanly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,13 @@
+{
+  "name": "proddash",
+  "version": "1.2.0",
+  "private": true,
+  "description": "Modular production dashboard for Waters Church — zero-dependency Node server + vanilla client",
+  "license": "UNLICENSED",
+  "engines": {
+    "node": ">=18"
+  },
+  "scripts": {
+    "start": "node server.js"
+  }
+}