Feat: Vulkan/RADV-Engine + vocab-gepruefte Spec-Drafts + Provisioning/Sync

Engine-Cutover ROCm/HIP -> Vulkan/RADV (gfx1151): +12-22% tg auf MoE (llama-bench
verifiziert, fast 53->65 t/s). ROCm-Build bleibt als Rollback unter /opt/llamacpp.

- Backend: vocab-aware Speculative Decoding. services/gguf_meta.py liest den
  Tokenizer-Fingerprint (model/pre/n_vocab) direkt aus dem GGUF-Header (ohne Modell-Load);
  register_model + migrate_config haengen nur VOCAB-KOMPATIBLE Drafts an (inkl. --spec-type,
  das in dieser llama.cpp-Generation noetig ist). Neue Endpoints /api/models/drafts + /{id}/draft.
- Frontend: idiotensichere Spec-Draft-UI (SpecDraftModal) - nur kompatible Drafts waehlbar,
  inkompatible gesperrt mit Begruendung; SPEC/SPEC?-Badge nach echtem Aktiv-Status; Rolle in AddModel.
- maintenance.py: Engine-Update-Quelle -> ggml-org/llama.cpp (Build-Nummer-Vergleich),
  ENGINE_PATH=/opt/llamacpp-vulkan.
- Startup-Warmup der brains (deploy/warmup.sh, self-detaching ExecStartPost) + deploy/provision-engine.sh.
- Cleanup: tote LiteLLM gateway/config.yaml + alle Referenzen (config.py/backup.py/backup.sh) entfernt;
  README + docs/memory aktualisiert.

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

backend/services/maintenance.py

@@ -7,6 +7,7 @@ erweiterte sudoers (siehe docs/BEDIENUNG.md). Lange Ops laufen als jobengine-Job
 """
 
 import os
+import re
 import subprocess
 import time
 from datetime import datetime
@@ -21,10 +22,30 @@ SYSTEM_SERVICES = {"llama-swap"}
 USER_SERVICES = {"mission-control-2", "hermes-gateway", "hermes-dashboard", "hermes-webui"}
 
 ENGINE_UPDATE_CMD = os.environ.get("MC_ENGINE_UPDATE_CMD", "")
-ENGINE_PATH = os.environ.get("MC_ENGINE_PATH", "/opt/llamacpp")
+# Engine = offizieller Vulkan-Build von ggml-org/llama.cpp (RADV auf Strix Halo).
+ENGINE_PATH = os.environ.get("MC_ENGINE_PATH", "/opt/llamacpp-vulkan")
+ENGINE_REPO = os.environ.get("MC_ENGINE_REPO", "ggml-org/llama.cpp")
 _engine_cache = {"ts": 0.0, "avail": False}
 
 
+def _installed_engine_build() -> int | None:
+    """Build-Nummer der installierten llama-server-Binary (z.B. 9821), oder None.
+    Vulkan-Build braucht LD_LIBRARY_PATH=ENGINE_PATH zum Start von --version."""
+    bin_path = os.path.join(ENGINE_PATH, "llama-server")
+    if not os.path.exists(bin_path):
+        return None
+    try:
+        env = dict(os.environ, LD_LIBRARY_PATH=ENGINE_PATH)
+        out = subprocess.run([bin_path, "--version"], capture_output=True, text=True,
+                             timeout=20, env=env)
+        txt = (out.stderr or "") + (out.stdout or "")
+        if (m := re.search(r"build:\s*\S+\s*\((\d+)\)", txt)) or (m := re.search(r"\bb(\d{3,})\b", txt)):
+            return int(m.group(1))
+    except Exception:
+        return None
+    return None
+
+
 def _ram_gb() -> float:
     return psutil.virtual_memory().total / (1024 ** 3)
 
@@ -45,11 +66,16 @@ def _engine_update_available() -> bool:
         return _engine_cache["avail"]
     avail = False
     try:
-        rel = httpx.get("https://api.github.com/repos/lemonade-sdk/llamacpp-rocm/releases/latest",
+        rel = httpx.get(f"https://api.github.com/repos/{ENGINE_REPO}/releases/latest",
                         timeout=6, headers={"User-Agent": "MissionControl2"}).json()
-        pub = datetime.fromisoformat(rel["published_at"].replace("Z", "+00:00")).timestamp()
-        inst = os.path.getmtime(ENGINE_PATH)
-        avail = pub > inst + 86400
+        tag = str(rel.get("tag_name", ""))
+        latest = int(m.group(1)) if (m := re.search(r"(\d{3,})", tag)) else None
+        installed = _installed_engine_build()
+        if latest is not None and installed is not None:
+            avail = latest > installed          # präziser Build-Nummer-Vergleich
+        else:                                   # Fallback: Release-Datum vs. Engine-mtime
+            pub = datetime.fromisoformat(rel["published_at"].replace("Z", "+00:00")).timestamp()
+            avail = pub > os.path.getmtime(ENGINE_PATH) + 86400
     except Exception:
         avail = False
     _engine_cache.update(ts=now, avail=avail)