Replace Clay with n8n, Ollama, SearXNG and browserless; add Telegram assistant

Remove the Clay role (Claude Code web UI) and its Anthropic API key.

New roles:
- ollama: local CPU LLM (qwen3:4b-instruct), internal network only
- browserless: headless Chromium for JavaScript-heavy pages
- searxng: metasearch backend for the chat web_search tool
- n8n at agent.ladkau.de: web chat (/chat), scheduled workflows,
  Telegram bot; workflows and credentials are imported from the repo

Telegram bot: Gemini 3.8 -> Gemini 3.5 -> local Qwen fallback chain,
/qwen to force the local model, /stocks and a weekday schedule
(07:30, 13:00, 17:40) for the MTE.DE / PTX.F stock report.

Also: dashboard and check-services entries for the chat, vault checks
for the new secrets (n8n, SearXNG, Gemini, Telegram, SMTP), updated
CLAUDE.md, runbooks and README.

ansible/roles/n8n/templates/smtp-credential.json.j2

@@ -0,0 +1,14 @@
+{
+  "id": "smtp00000000001",
+  "name": "Strato SMTP",
+  "type": "smtp",
+  "data": {
+    "user": {{ smtp_user | to_json }},
+    "password": {{ smtp_password | to_json }},
+    "host": {{ smtp_host | to_json }},
+    "port": {{ smtp_port }},
+    "secure": {{ smtp_secure | to_json }},
+    "disableStartTls": false,
+    "hostName": ""
+  }
+}