Fix: Modell-Manager Rollen-Taxonomie vereinheitlicht (5 Rollen) + echter Vocab-Check

- Rollen ueberall = fast/heavy/coder/vision/scout (eine Quelle der Wahrheit):
  sources.py CATEGORIES (agent/reasoning raus, fast/heavy rein), llamaswap.ROLE_IDS,
  maintenance ROLE_MAP entfernt (Discover-Rollen == Serving-Rollen), Discover.tsx
  ROLE_METADATA, ModelBadges.ROLES, ActiveModelsCard (stale reasoning-Farbe raus).
  Behebt: Discover zeigte "Reasoning"/"agent"; aus Discover installierte Modelle
  landeten in keinem Cockpit-Slot.
- gguf_meta: Vocab-Check jetzt ECHT - sha256 ueber die vollstaendige Token-Liste statt
  nur Metadaten. Familienunabhaengig (Qwen/Llama/Mistral/...). Verifiziert: Coder + Qwen3-0.6B
  byte-identisch (kompatibel), Qwen3.6 abweichend (inkompatibel), 0.11s/Scan.
- RolesCard SPEC-Badge -> spec_active (Konsistenz mit Cockpit).

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

frontend/src/components/dashboard/ActiveModelsCard.tsx

@@ -8,7 +8,6 @@ const ROLE_TONE: Record<string, string> = {
   fast: "bg-cyan-500/15 text-cyan-400 border-cyan-500/25",
   heavy: "bg-amber-500/15 text-amber-400 border-amber-500/25",
   coder: "bg-violet-500/15 text-violet-400 border-violet-500/25",
-  reasoning: "bg-emerald-500/15 text-emerald-400 border-emerald-500/25",
   vision: "bg-pink-500/15 text-pink-400 border-pink-500/25",
   scout: "bg-teal-500/15 text-teal-400 border-teal-500/25",
   hermes: "bg-indigo-500/15 text-indigo-400 border-indigo-500/25",

frontend/src/components/dashboard/RolesCard.tsx

@@ -57,7 +57,7 @@ export function RolesCard() {
                               PC
                             </span>
                           )}
-                          {m.spec_draft_model && (
+                          {m.spec_active && (
                             <span className="text-[7px] leading-none font-mono font-bold bg-emerald-500/10 text-emerald-400 border border-emerald-500/20 px-1 py-0.5 rounded" title={`Speculative Decoding aktiv (Draft: ${m.spec_draft_model})`}>
                               SPEC
                             </span>