Sprint 1 : scaffolding complet de Glibredecision

Plateforme de decisions collectives pour Duniter/G1.
Backend FastAPI async + PostgreSQL (14 tables, 8 routers, 6 services,
moteur de vote avec formule d'inertie WoT/Smith/TechComm).
Frontend Nuxt 4 + Nuxt UI v3 + Pinia (9 pages, 5 stores).
Infrastructure Docker + Woodpecker CI + Traefik.
Documentation technique et utilisateur (15 fichiers).
Seed : Licence G1, Engagement Forgeron v2.0.0, 4 protocoles de vote.
30 tests unitaires (formules, mode params, vote nuance) -- tous verts.

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

frontend/app/composables/useApi.ts

@@ -0,0 +1,31 @@
+/**
+ * Composable for making authenticated API calls to the Glibredecision backend.
+ *
+ * Uses the runtime config `apiBase` and automatically injects the Bearer token
+ * from the auth store when available.
+ */
+export function useApi() {
+  const config = useRuntimeConfig()
+  const auth = useAuthStore()
+
+  /**
+   * Perform a typed fetch against the backend API.
+   *
+   * @param path - API path relative to apiBase, e.g. "/documents"
+   * @param options - $fetch options (method, body, query, headers, etc.)
+   * @returns Typed response
+   */
+  async function $api<T>(path: string, options: Record<string, any> = {}): Promise<T> {
+    const headers: Record<string, string> = {}
+    if (auth.token) {
+      headers.Authorization = `Bearer ${auth.token}`
+    }
+
+    return await $fetch<T>(`${config.public.apiBase}${path}`, {
+      ...options,
+      headers: { ...headers, ...options.headers },
+    })
+  }
+
+  return { $api }
+}