feat(media): Phase 8.G noeuds-ecoles + popup RAG info + lien Bonpote + migration Nebius

- CartePensees: noeuds ecole visibles (cercles proportionnels count auteurs, cliquables, emit select-ecole)
- CartePensees: collision D3 ajustee pour repulsion auteurs autour des noeuds ecole
- FicheEcole: nouveau composant modal (liste auteurs ingeres/non-ingeres, interroger RAG)
- media: header lien Bonpote V2 cliquable + bouton i info RAG
- media: popup FRACAS (description RAG, 662 dimensions, 3 couches, localStorage 1ere visite)
- media: FicheEcole branchee (select-ecole, select-auteur-from-ecole, interroger-ecole)
- ChatbotPensees: suppression mention corpusCount hardcoded (double source de verite)
- chatbot, chatbot-v2, chatbot-reseaux, chatbot-taff: migration Mistral -> Nebius DeepSeek-V3.2
- nuxt.config: ajout nebiusApiKey runtime config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/CartePensees.vue

@@ -39,7 +39,7 @@ const LINKS_INFLUENCE = [
 ]
 
 const props = defineProps<{ data: PenseesData | null; active?: boolean }>()
-const emit = defineEmits<{ 'select-auteur': [id: string] }>()
+const emit = defineEmits<{ 'select-auteur': [id: string]; 'select-ecole': [id: string] }>()
 
 const svgRef = ref<SVGElement | null>(null)
 const tooltipRef = ref<HTMLElement | null>(null)
@@ -201,6 +201,12 @@ async function initGraph() {
     fx: W * e.x_hint, fy: H * e.y_hint,
   }))
 
+  // Rayon proportionnel au nombre d'auteurs de l'ecole
+  const ecoleAuteurCounts = new Map<string, number>()
+  props.data.ecoles.forEach(e => ecoleAuteurCounts.set(e.id, 0))
+  props.data.auteurs.forEach(a => ecoleAuteurCounts.set(a.ecole_principale, (ecoleAuteurCounts.get(a.ecole_principale) ?? 0) + 1))
+  const ecoleRadius = (count: number) => Math.max(16, Math.min(36, 13 + count * 1.5))
+
   const allNodes = [...ecoleFixedNodes, ...auteurNodes]
 
   if (simulation) simulation.stop()
@@ -209,7 +215,7 @@ async function initGraph() {
     .force('link', d3.forceLink(links).id((d: any) => d.id).distance(85).strength((d: any) => d.strength ?? 0.5))
     .force('charge', d3.forceManyBody().strength(-30))
     .force('center', d3.forceCenter(W / 2, H / 2).strength(0.02))
-    .force('collision', d3.forceCollide().radius((d: any) => d.type === 'auteur' ? 12 : 0))
+    .force('collision', d3.forceCollide().radius((d: any) => d.type === 'ecole-fixed' ? ecoleRadius(ecoleAuteurCounts.get(d.ecoleId) ?? 0) + 4 : 12))
     .force('forceX', d3.forceX<any>((d: any) => {
       if (d.type === 'auteur') {
         const pos = ecolePositions.get(d.ecole_principale)
@@ -225,6 +231,33 @@ async function initGraph() {
       return H / 2
     }).strength(0.15))
 
+  // ---- NOEUDS ECOLES visibles (couche 3.5) ----
+  // Cercles proportionnels au count d'auteurs, fixes aux centroids Bonpote, cliquables
+  const gEcoles = g.append('g').attr('class', 'ecoles-nodes')
+  ecoleFixedNodes.forEach(eNode => {
+    const ecole = ecoleMap.get(eNode.ecoleId)
+    if (!ecole) return
+    const count = ecoleAuteurCounts.get(eNode.ecoleId) ?? 0
+    const r = ecoleRadius(count)
+    gEcoles.append('circle')
+      .attr('cx', eNode.fx).attr('cy', eNode.fy).attr('r', r)
+      .attr('fill', ecole.color + '22').attr('stroke', ecole.color).attr('stroke-width', 2.5)
+      .attr('class', 'ecole-node').style('cursor', 'pointer')
+      .on('mouseenter', (e: any) => {
+        if (!tooltipRef.value) return
+        tooltipRef.value.innerHTML = `<strong>${ecole.label}</strong> <span style="opacity:0.6;font-size:0.7rem;">${count} auteur${count > 1 ? 's' : ''}</span><br><span style="opacity:0.75;font-size:0.72rem;">${ecole.description}</span>`
+        tooltipRef.value.style.opacity = '1'
+      })
+      .on('mousemove', (e: any) => {
+        if (!tooltipRef.value || !svgEl) return
+        const rect = (svgEl as HTMLElement).getBoundingClientRect()
+        tooltipRef.value.style.left = (e.clientX - rect.left + 14) + 'px'
+        tooltipRef.value.style.top = (e.clientY - rect.top - 10) + 'px'
+      })
+      .on('mouseleave', () => { if (tooltipRef.value) tooltipRef.value.style.opacity = '0' })
+      .on('click', (e: any) => { e.stopPropagation(); emit('select-ecole', eNode.ecoleId) })
+  })
+
   // ---- LIENS APPARTENANCE (couche 4) ----
   const gLinks = g.append('g').attr('class', 'links-appartenance')
   d3LinkSel = gLinks.selectAll('line').data(links).join('line')
@@ -353,6 +386,13 @@ defineExpose({ triggerResize })
   cursor: default;
 }
 
+.ecole-node {
+  transition: opacity 0.15s, r 0.15s;
+}
+.ecole-node:hover {
+  opacity: 0.75;
+}
+
 /* ---- Labels ecoles : calque separe NON-blurre (Phase 8.D) ---- */
 .voronoi-labels {
   pointer-events: none;