docs: move BEDIENUNGSANLEITUNG and INSTALL_FROM_ARCHIVE into docs/

Keep only README, LICENSE, and CHANGELOG as prose at the repo root
(tooling/convention) and move the remaining manuals under docs/ next to
SECURITY_AND_OPERATIONS.md.

- git mv the two files into docs/ (history preserved).
- Update all cross-references: README doc-index links, the internal
  SECURITY_AND_OPERATIONS link and the §12 pointer list in
  BEDIENUNGSANLEITUNG, and the repo inventory in SECURITY_AND_OPERATIONS §1.
- build_archive.py: point REQUIRED_FILES at docs/ and drop the now-redundant
  INCLUDE_FILES entries (the docs/ dir is included wholesale).
- build_archive.py: drop the obsolete requirements.txt<->pyproject dependency
  mirror check, which broke once requirements.txt was reduced to `.`
  (pyproject is the single source of truth). Verified by building and
  re-opening the archive.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -15,8 +15,8 @@ Fehlerbehandlung.
 | Dokument | Für wen / wofür |
 |---|---|
 | README (diese Datei) | Schnelleinstieg: Installation, Konfiguration, Verwendung |
-| [`BEDIENUNGSANLEITUNG.md`](BEDIENUNGSANLEITUNG.md) | Vollständiges Benutzerhandbuch (alle Aktionen, Optionen, Fehlersuche) |
-| [`INSTALL_FROM_ARCHIVE.md`](INSTALL_FROM_ARCHIVE.md) | Installation aus dem `.tar.gz`-Archiv + Archiv selbst bauen/verifizieren |
+| [`docs/BEDIENUNGSANLEITUNG.md`](docs/BEDIENUNGSANLEITUNG.md) | Vollständiges Benutzerhandbuch (alle Aktionen, Optionen, Fehlersuche) |
+| [`docs/INSTALL_FROM_ARCHIVE.md`](docs/INSTALL_FROM_ARCHIVE.md) | Installation aus dem `.tar.gz`-Archiv + Archiv selbst bauen/verifizieren |
 | [`docs/SECURITY_AND_OPERATIONS.md`](docs/SECURITY_AND_OPERATIONS.md) | Architektur, Modul-/Repo-Übersicht, Sicherheits- & Betriebsmodell |
 | `man/llamacppctl.1` | Vollständige Optionsreferenz (`man llamacppctl` bzw. `man ./man/llamacppctl.1`) |
 | [`CHANGELOG.md`](CHANGELOG.md) | Versionshistorie |