Fix: "Modelle finden" bevorzugt faehigste passende Modelle (kein Downgrade) + Rollen-Farben zentral

- discover.rank_runnable: rankt jetzt fit-level > params_b(desc) > downloads -> fuer die
  128GB-Box wird das faehigste passende (MoE-)Modell empfohlen statt kleiner Populaer-Modelle.
  Top-4-Anzeige nutzt dasselbe Ranking.
- maintenance.model_upgrades: schlaegt KEIN Downgrade mehr vor (rec.params_b >= installiert*0.95).
  Behebt: fast 35B-A3B -> 4B wurde faelschlich als Upgrade angeboten.
- Frontend: Rollen-Farb-Mapping zentralisiert in ModelBadges (ROLE_TONE/roleTone);
  Cockpit/RolesCard/ActiveModelsCard nutzen es statt eigener Duplikate.

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

frontend/src/components/dashboard/ActiveModelsCard.tsx

@@ -3,15 +3,7 @@ import { Activity, Zap, Moon } from "lucide-react"
 import { useModels, useTokenStats } from "@/lib/queries"
 import { fmtSize } from "@/lib/format"
 import { cn } from "@/lib/utils"
-
-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",
-  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",
-}
+import { roleTone } from "@/components/models/ModelBadges"
 
 export function ActiveModelsCard() {
   const { data } = useModels(2_000)
@@ -65,7 +57,7 @@ export function ActiveModelsCard() {
                 <div className="flex items-center gap-1.5">
                   {m.role && (
                     <span className={cn("text-[8px] font-semibold uppercase px-1.5 py-0.5 rounded font-mono border tracking-wider shrink-0",
-                      ROLE_TONE[m.role] || "bg-slate-500/15 text-slate-300 border-slate-500/25")}>
+                      roleTone(m.role))}>
                       {m.role}
                     </span>
                   )}

frontend/src/components/dashboard/RolesCard.tsx

@@ -1,8 +1,7 @@
 import { Layers } from "lucide-react"
 import { useModels } from "@/lib/queries"
 import { cn } from "@/lib/utils"
-
-const ROLES = ["fast", "heavy", "coder", "vision", "scout"]
+import { ROLES, roleTone } from "@/components/models/ModelBadges"
 
 export function RolesCard() {
   const { data } = useModels(3_000)
@@ -37,12 +36,7 @@ export function RolesCard() {
                 <div className="min-w-0 flex-1 mr-2">
                   <div className="flex items-center gap-2 min-w-0">
                     <span className={cn("text-[9px] font-semibold uppercase px-1.5 py-0.5 rounded font-mono border tracking-wider shrink-0",
-                      role === "fast" ? "bg-cyan-500/15 text-cyan-400 border-cyan-500/25" :
-                      role === "heavy" ? "bg-amber-500/15 text-amber-400 border-amber-500/25" :
-                      role === "coder" ? "bg-violet-500/15 text-violet-400 border-violet-500/25" :
-                      role === "vision" ? "bg-pink-500/15 text-pink-400 border-pink-500/25" :
-                      "bg-teal-500/15 text-teal-400 border-teal-500/25"
-                    )}>
+                      roleTone(role))}>
                       {role}
                     </span>
 

frontend/src/components/models/ModelBadges.tsx

@@ -4,6 +4,20 @@ import { cn } from "@/lib/utils"
 // Die 5 kanonischen Serving-Rollen (identisch zu Backend sources.py/llamaswap.ROLE_IDS).
 export const ROLES = ["fast", "heavy", "coder", "vision", "scout"]
 
+// Rolle → Farbton. EINE Quelle der Wahrheit für alle Rollen-Badges (Cockpit, RolesCard,
+// ActiveModelsCard, …). `hermes` = Agent-Hirn (taucht als geladenes Modell auf).
+export 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",
+  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",
+}
+
+export const roleTone = (role?: string | null) =>
+  (role && ROLE_TONE[role]) || "bg-slate-500/15 text-slate-300 border-slate-500/25"
+
 export function FitBadge({ fit }: { fit: Fit }) {
   const tone = {
     perfect: "bg-emerald-500/15 text-emerald-400 border border-emerald-500/20",