document repo map and local dev, add deploy-prod skill

- CLAUDE.md gains a repo map, endpoint list, and local dev setup
  (server serves only ./public — symlink ../frontend once)
- new deploy-prod skill captures the Dokploy deploy + buildTag
  verification flow; track .agents/.claude skills and skills-lock.json
- ignore server/data, test-results, .claude/worktrees

.gitignore

@@ -24,3 +24,9 @@ node_modules/
 # local data
 *.tmp
 .DS_Store
+
+# runtime/local artifacts
+server/data/
+test-results/
+.claude/worktrees/
+server/public