Sprint 3 : protocoles de vote et boite a outils

Backend:
- Sessions de vote : list, close, tally, threshold details, auto-expiration
- Protocoles : update, simulate, meta-gouvernance, formulas CRUD
- Service vote enrichi : close_session, get_threshold_details, nuanced breakdown
- Schemas : ThresholdDetailOut, VoteResultOut, FormulaSimulationRequest/Result
- WebSocket broadcast sur chaque vote + fermeture session
- 25 nouveaux tests (threshold details, close, nuanced, simulation)

Frontend:
- 5 composants vote : VoteBinary, VoteNuanced, ThresholdGauge, FormulaDisplay, VoteHistory
- 3 composants protocoles : ProtocolPicker, FormulaEditor, ModeParamsDisplay
- Simulateur de formules interactif (page /protocols/formulas)
- Page detail protocole (/protocols/[id])
- Composable useWebSocket (live updates)
- Composable useVoteFormula (calcul client-side reactif)
- Integration KaTeX pour rendu LaTeX des formules

Documentation:
- API reference : 8 nouveaux endpoints documentes
- Formules : tables d'inertie, parametres detailles, simulation API
- Guide vote : vote binaire/nuance, jauge, historique, simulateur, meta-gouvernance

55 tests passes (+ 1 skipped), 126 fichiers total.

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

frontend/app/components/protocols/ModeParamsDisplay.vue

@@ -0,0 +1,61 @@
+<script setup lang="ts">
+/**
+ * Display decoded mode params string as labeled badges/chips.
+ *
+ * Parses the compact mode params string and renders each parameter
+ * as a human-readable chip.
+ */
+const props = defineProps<{
+  modeParams: string
+}>()
+
+interface ParamChip {
+  code: string
+  label: string
+  value: string
+  color: string
+}
+
+const chips = computed((): ParamChip[] => {
+  if (!props.modeParams) return []
+
+  try {
+    const parsed = parseModeParams(props.modeParams)
+    const result: ParamChip[] = []
+
+    result.push({ code: 'D', label: 'Duree', value: `${parsed.duration_days}j`, color: 'primary' })
+    result.push({ code: 'M', label: 'Majorite', value: `${parsed.majority_pct}%`, color: 'info' })
+    result.push({ code: 'B', label: 'Base', value: String(parsed.base_exponent), color: 'neutral' })
+    result.push({ code: 'G', label: 'Gradient', value: String(parsed.gradient_exponent), color: 'neutral' })
+
+    if (parsed.constant_base > 0) {
+      result.push({ code: 'C', label: 'Constante', value: String(parsed.constant_base), color: 'warning' })
+    }
+    if (parsed.smith_exponent !== null) {
+      result.push({ code: 'S', label: 'Smith', value: String(parsed.smith_exponent), color: 'success' })
+    }
+    if (parsed.techcomm_exponent !== null) {
+      result.push({ code: 'T', label: 'TechComm', value: String(parsed.techcomm_exponent), color: 'purple' })
+    }
+
+    return result
+  } catch {
+    return []
+  }
+})
+</script>
+
+<template>
+  <div class="flex flex-wrap items-center gap-2">
+    <span class="font-mono text-xs font-bold text-primary mr-1">{{ modeParams }}</span>
+    <UBadge
+      v-for="chip in chips"
+      :key="chip.code"
+      :color="(chip.color as any)"
+      variant="subtle"
+      size="xs"
+    >
+      {{ chip.label }}: {{ chip.value }}
+    </UBadge>
+  </div>
+</template>