P2.4: Update .gitignore and .dockerignore for JSON storage

Drop pysentry.yaml references; add gosentry.json and jobs.json.
Keep *.yaml wildcard to ignore legacy files during import window.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.dockerignore

@@ -2,7 +2,7 @@
 bin
 dist
 logs
-gosentry.yaml
-pysentry.yaml
-jobs.yaml
+gosentry.json
+jobs.json
+*.yaml
 *.exe