fix(mindspace): keep standalone service data paths under MindSpace root

Prevent Portal .env from overriding MindSpace storage/users roots, and
set launchd env plus runtime docs to use /Users/john/MindSpace paths.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/build-mindspace-service-runtime.mjs

@@ -128,7 +128,11 @@ async function writeMetadata() {
     '',
     'Production runtime target:',
     '  /Users/john/MindSpace',
-    'Shared persisted data root:',
+    'Standalone persisted data root:',
+    '  /Users/john/MindSpace/data/mindspace',
+    'Standalone users root:',
+    '  /Users/john/MindSpace/users',
+    'Shared Portal/H5 root:',
     '  /Users/john/Project/Memind',
     '',
     'This artifact contains:',
@@ -145,7 +149,8 @@ async function writeMetadata() {
     '  users/ runtime data',
     '  .env / .env.local',
     '',
-    'The production service keeps using shared persisted paths from /Users/john/Project/Memind.',
+    'The production service may read shared Portal secrets from /Users/john/Project/Memind/.env,',
+    'but standalone MindSpace data paths must stay under /Users/john/MindSpace.',
     '',
     `Git head ref: ${head.trim()}`,
   ].join('\n');