Consolidate Maria control into the shared Discord-bridge dashboard

Drop the standalone maria-dashboard.service — one common panel now
controls both bridges, at the operator's request. discord-bridge's
dashboard/api.py gains a Maria section (fixed-unit start/stop/restart
for maria-whatsapp/maria-rag, WhatsApp status+QR proxy, document CRUD,
reindex, Drive sync trigger, log tail) reached via subprocess/HTTP —
no cross-module imports, to avoid colliding with discord-bridge's own
`config` module name. index.html gets a matching "Maria — WhatsApp +
RAG" section. maria-whatsapp-bridge loses its dashboard/ folder and
DASHBOARD_* env keys; install.sh/README point at the shared panel.

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

proxmox/lxc171-claude-agent/maria-whatsapp-bridge/ops/env.example

@@ -32,11 +32,8 @@ POLL_INTERVAL_S=2
 # headless).
 DRIVE_REMOTE=
 
-# --- dashboard de control (dashboard/api.py) --------------------------------
-# Token de acces. Generat automat de ops/install.sh daca lipseste.
-DASHBOARD_TOKEN=
-# `off` scoate complet login-ul. De pus DOAR daca panoul ramane strict pe
-# 127.0.0.1 / tailnet (acelasi motiv ca la discord-bridge).
-DASHBOARD_AUTH=
-DASHBOARD_BIND=127.0.0.1
-DASHBOARD_PORT=18792
+# --- control -----------------------------------------------------------------
+# Fara dashboard propriu: start/stop/restart, documente, reindexare si
+# sincronizare Drive se fac din dashboard-ul puntii Discord (discord-bridge/),
+# sectiunea "Maria — WhatsApp + RAG" — un singur panou comun, o singura
+# autentificare (DASHBOARD_TOKEN din ~/.claude-discord/env).