Auth : mode prototype factice en prod + fix test DB manquante

- Login : panneau proto-mode en avant quand DEMO_MODE actif (profils API)
  masque le formulaire extension-required ; note trustWallet à venir
- auth.ts : TODO trustWallet avec protocole postMessage prévu
- routers/auth.py : TODO trustWallet au point de vérification signature
- test_middleware : fixture _create_tables (autouse) — ASGITransport ne
  déclenche pas le lifespan, init_db() ne tournait pas → duniter_identities
  introuvable au verify ; 224/224 passent

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

frontend/app/pages/login.vue

@@ -100,6 +100,8 @@ const activeStepIndex = computed(() => {
   }
 })
 
+const isProtoMode = computed(() => devProfiles.value.length > 0)
+
 onMounted(() => {
   if (auth.isAuthenticated) {
     router.push('/')
@@ -166,45 +168,50 @@ onMounted(() => {
         <span>Connecte. Redirection...</span>
       </div>
 
-      <!-- Button -->
-      <button
-        class="login-card__btn"
-        :disabled="!address.trim() || step === 'success' || auth.loading"
-        @click="handleLogin"
-      >
-        <UIcon v-if="auth.loading" name="i-lucide-loader-2" class="animate-spin" />
-        <UIcon v-else name="i-lucide-log-in" />
-        <span>{{ auth.loading ? 'Verification...' : 'Se connecter' }}</span>
-      </button>
-
-      <!-- Dev Mode Panel -->
-      <div v-if="devProfiles.length" class="dev-panel">
-        <div class="dev-panel__header">
-          <UIcon name="i-lucide-bug" />
-          <span>Mode Dev — Connexion rapide</span>
+      <!-- Mode prototype : profils démo -->
+      <template v-if="isProtoMode">
+        <div class="proto-panel">
+          <div class="proto-panel__header">
+            <UIcon name="i-lucide-flask-conical" />
+            <span>Mode prototype — sélectionnez un profil</span>
+          </div>
+          <div class="proto-panel__profiles">
+            <button
+              v-for="p in devProfiles"
+              :key="p.address"
+              class="dev-profile"
+              :disabled="devLoading || step === 'success'"
+              @click="loginAsProfile(p)"
+            >
+              <div class="dev-profile__dot" :style="{ background: statusColor(p) }" />
+              <div class="dev-profile__info">
+                <span class="dev-profile__name">{{ p.display_name }}</span>
+                <span class="dev-profile__status">{{ statusLabel(p) }}</span>
+              </div>
+              <span class="dev-profile__addr">{{ p.address.slice(0, 8) }}...</span>
+            </button>
+          </div>
+          <p class="proto-panel__note">
+            Authentification trustWallet à venir — intégration librodrome
+          </p>
         </div>
-        <div class="dev-panel__profiles">
-          <button
-            v-for="p in devProfiles"
-            :key="p.address"
-            class="dev-profile"
-            :disabled="devLoading || step === 'success'"
-            @click="loginAsProfile(p)"
-          >
-            <div class="dev-profile__dot" :style="{ background: statusColor(p) }" />
-            <div class="dev-profile__info">
-              <span class="dev-profile__name">{{ p.display_name }}</span>
-              <span class="dev-profile__status">{{ statusLabel(p) }}</span>
-            </div>
-            <span class="dev-profile__addr">{{ p.address.slice(0, 8) }}...</span>
-          </button>
-        </div>
-      </div>
+      </template>
 
-      <!-- Note -->
-      <p class="login-card__note">
-        Aucun mot de passe. Authentification par signature cryptographique.
-      </p>
+      <!-- Mode production : formulaire + extension -->
+      <template v-else>
+        <button
+          class="login-card__btn"
+          :disabled="!address.trim() || step === 'success' || auth.loading"
+          @click="handleLogin"
+        >
+          <UIcon v-if="auth.loading" name="i-lucide-loader-2" class="animate-spin" />
+          <UIcon v-else name="i-lucide-log-in" />
+          <span>{{ auth.loading ? 'Verification...' : 'Se connecter' }}</span>
+        </button>
+        <p class="login-card__note">
+          Aucun mot de passe. Authentification par signature cryptographique.
+        </p>
+      </template>
     </div>
   </div>
 </template>
@@ -453,32 +460,40 @@ onMounted(() => {
   cursor: not-allowed;
 }
 
-/* Dev panel */
-.dev-panel {
-  border: 2px dashed var(--mood-warning, #f59e0b);
+/* Proto panel */
+.proto-panel {
   border-radius: 16px;
   padding: 1rem;
-  background: rgba(245, 158, 11, 0.04);
+  background: var(--mood-accent-soft);
+  box-shadow: 0 2px 12px var(--mood-shadow, rgba(0,0,0,0.06));
 }
 
-.dev-panel__header {
+.proto-panel__header {
   display: flex;
   align-items: center;
   gap: 0.5rem;
   font-size: 0.8125rem;
   font-weight: 700;
-  color: var(--mood-warning, #f59e0b);
+  color: var(--mood-accent);
   margin-bottom: 0.75rem;
   text-transform: uppercase;
   letter-spacing: 0.04em;
 }
 
-.dev-panel__profiles {
+.proto-panel__profiles {
   display: flex;
   flex-direction: column;
   gap: 0.5rem;
 }
 
+.proto-panel__note {
+  margin-top: 0.75rem;
+  font-size: 0.75rem;
+  color: var(--mood-text-muted);
+  opacity: 0.7;
+  text-align: center;
+}
+
 .dev-profile {
   display: flex;
   align-items: center;