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/rag/config.py

@@ -34,8 +34,6 @@ DEFAULTS: dict[str, str] = {
     "MAX_TOKENS": "250",
     "POLL_INTERVAL_S": "2",
     "TEST_MODE_SELF_CHAT_ONLY": "true",
-    "DASHBOARD_BIND": "127.0.0.1",
-    "DASHBOARD_PORT": "18792",
     # Tinta rclone pentru sincronizarea depozitului de documente, ex:
     # "gdrive:romfast/document_store" (dosarul D:\GoogleDrive\romfast\document_store
     # de pe Windows, vazut prin Google Drive API). Gol = sincronizare dezactivata,