feat(automation): autonomous pipeline with Telegram bot and N8N integration

- Add full auto pipeline: RSS ingest → GPT relevance score → AI rewrite → WP draft
- Add Telegram bot with inline buttons (rewrite/discard/override) and commands (/run, /rejected, /status)
- Add smart publish scheduler: max 2 drafts/day, spread over week (09:00 & 14:00 CET)
- Add N8N API endpoints (/api/n8n/pipeline, /api/n8n/ingest) with X-API-Key auth
- Add GPT-based relevance scoring (0-100) for VanLife/Camping/Outdoor topics
- Remove Ampel risk-level policy check from ingestion (all enabled feeds are used)
- Add Telegram webhook endpoint and setup endpoint
- Add delete_wp_post() for Telegram discard action
- Add DB migrations for relevance_score and scheduled_publish_at columns
- Update .env.example with all new configuration variables
- Add docs/AUTOMATION.md with full setup and usage documentation

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

backend/app/wordpress.py

@@ -373,3 +373,18 @@ def publish_article_draft(article: dict[str, Any]) -> tuple[int, str | None]:
 
 def selected_image_exists(article: dict[str, Any]) -> bool:
     return _selected_image_url_from_meta(article.get("meta_json")) is not None
+
+
+def delete_wp_post(wp_post_id: int) -> None:
+    """Permanently delete a WordPress post (moves to trash, then deletes)."""
+    settings = get_settings()
+    if not settings.wordpress_base_url or not settings.wordpress_username or not settings.wordpress_app_password:
+        raise RuntimeError("WordPress Konfiguration fehlt")
+    auth = _auth_header(settings.wordpress_username, settings.wordpress_app_password)
+    # force=true skips trash
+    _wp_request(
+        base_url=settings.wordpress_base_url,
+        auth_header=auth,
+        method="DELETE",
+        endpoint=f"posts/{wp_post_id}?force=true",
+    )