Stop tracking runtime data; seed from *.example.json

data/profiles.json and data/users.json hold live tenant config and
user records that the app rewrites at runtime (lastLogin etc.), so they
dirtied git status on every run. Untrack them and gitignore data/*.json
(plus logs/exports/templates/audit), keeping committed *.example.json
seeds. Repositories already create empty files on first save, so a
fresh clone starts clean and provisions the first user as Admin.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -56,3 +56,11 @@ TestResults/
 *.trx
 *.coveragexml
 coverage/
+
+## Runtime data (seeded from *.example.json; never commit live tenant/user data)
+data/*.json
+!data/*.example.json
+data/logs/
+data/exports/
+data/templates/
+data/audit.jsonl