feat: schedules UI, task cron type, monthly/yearly schedules, AE DB tools, integrations page

- Schedules web UI (/settings/crons): list, add, edit, pause/resume, delete jobs
- cron task type: full orchestrator tool loop on a schedule, result → notification channel
- parse_schedule: monthly/yearly formats (monthly:DD:HH:MM, yearly:MM:DD:HH:MM)
- HA inbound webhook tools toggle: orchestrator loop vs. direct LLM, configurable in UI
- ae_db_query/describe/show_view: SELECT-only Aether MariaDB access (admin, per-user creds)
- /settings/integrations: admin-only page for Aether DB credentials
- Schedules nav link added to all settings pages
- pymysql added to requirements
- Docs updated: HELP.md, MASTER.md, CLAUDE.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cortex/routers/help.py

@@ -12,7 +12,7 @@ import jwt
 from fastapi import APIRouter, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 
-from auth_utils import COOKIE_NAME, decode_token
+from auth_utils import COOKIE_NAME, decode_token, _read_auth
 from persona import list_user_personas
 
 logger = logging.getLogger(__name__)
@@ -64,4 +64,7 @@ async def help_page(request: Request, persona: str = ""):
         f'{{user: "{username}", persona: "{back_persona}", backHref: "{back_href}"}};</script>'
     )
     html = html.replace("</head>", f"{config_tag}\n</head>", 1)
+    nav = '<a href="/settings/integrations" class="nav-link">Integrations</a>' \
+        if _read_auth(username).get("role", "user") == "admin" else ""
+    html = html.replace("{{ integrations_nav }}", nav)
     return HTMLResponse(html)