chore: ROADMAP Phase 8, parallel AI team script, docker and infra updates

- ROADMAP.md: add Phase 8 — Freifunk / Community Mesh Networking with
  F0-F8 checkboxes; F0-F2 marked complete
- scripts/ai_team.py: rewrite to support asyncio.gather parallel agent
  runs; add --sprint flag with predefined work packages (audit,
  phase1-hardening, phase2-tests, phase1-infra, status); add --parallel
  for ad-hoc concurrent agent invocations; output written to
  logs/ai_team/<sprint>_<timestamp>/<agent>.md
- scripts/dev-shell.sh: convenience development shell helper
- docker: update Dockerfiles for quicproquo rename and new server flags
- .gitignore: add qpq-state artifacts (*.bin, *.session, *.pending.ks,
  *.convdb*)

.gitignore

@@ -7,4 +7,13 @@ docs/book/
 # Server/client runtime data — do not commit certs, keys, or DBs
 data/
 *.der
+*.pem
+*.db
+*.bin
+*.ks
+*.session
+*.convdb
+*.convdb-shm
+*.convdb-wal
+*.pending.ks
 qpq-server.toml