Add authority bootstrap flows and Concelier ops runbooks

src/StellaOps.Feedser.Source.CertBund.Tests/Fixtures/certbund-detail.json

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+{
+  "name": "WID-SEC-2025-2264",
+  "title": "Ivanti Endpoint Manager: Mehrere Schwachstellen ermöglichen Codeausführung",
+  "summary": "Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Ivanti Endpoint Manager ausnutzen.",
+  "description": "<p>Ivanti Endpoint Manager weist mehrere Schwachstellen auf.</p><p>Ein Angreifer kann beliebigen Code ausführen.</p>",
+  "severity": "hoch",
+  "language": "de",
+  "published": "2025-10-14T06:24:49Z",
+  "updated": "2025-10-14T07:00:00Z",
+  "cveIds": [
+    "CVE-2025-1234",
+    "CVE-2025-5678"
+  ],
+  "references": [
+    {
+      "url": "https://example.com/vendor/advisory",
+      "label": "Vendor Advisory"
+    },
+    {
+      "url": "https://example.com/mitre",
+      "label": "MITRE"
+    }
+  ],
+  "products": [
+    {
+      "vendor": "Ivanti",
+      "name": "Endpoint Manager",
+      "versions": "2023.1 bis 2024.2"
+    },
+    {
+      "vendor": "Ivanti",
+      "name": "Endpoint Manager Cloud",
+      "versions": "alle"
+    }
+  ]
+}

src/StellaOps.Feedser.Source.CertBund.Tests/Fixtures/certbund-feed.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0">
+  <channel>
+    <title>BSI Warn- und Informationsdienst</title>
+    <link>https://wid.cert-bund.de/portal/wid/securityadvisory</link>
+    <description>Test feed</description>
+    <pubDate>Tue, 14 Oct 2025 07:06:21 GMT</pubDate>
+    <item>
+      <title>[hoch] Ivanti Endpoint Manager: Mehrere Schwachstellen ermöglichen Codeausführung</title>
+      <link>https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-2264</link>
+      <category>hoch</category>
+      <pubDate>Tue, 14 Oct 2025 06:24:49 GMT</pubDate>
+    </item>
+  </channel>
+</rss>