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>

backend/app/schemas/auth.py

@@ -0,0 +1,53 @@
+from __future__ import annotations
+
+from datetime import datetime
+from uuid import UUID
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+# ── Request schemas ──────────────────────────────────────────────
+
+
+class ChallengeRequest(BaseModel):
+    """Request a challenge nonce for Ed25519 authentication."""
+
+    address: str = Field(..., min_length=1, max_length=64, description="Duniter V2 SS58 address")
+
+
+class VerifyRequest(BaseModel):
+    """Submit the signed challenge to obtain a session token."""
+
+    address: str = Field(..., min_length=1, max_length=64)
+    signature: str = Field(..., description="Ed25519 signature of the challenge (hex)")
+    challenge: str = Field(..., description="The challenge string that was signed")
+
+
+# ── Response schemas ─────────────────────────────────────────────
+
+
+class ChallengeResponse(BaseModel):
+    """Returned after requesting a challenge."""
+
+    challenge: str
+    expires_at: datetime
+
+
+class IdentityOut(BaseModel):
+    """Public representation of a Duniter identity."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: UUID
+    address: str
+    display_name: str | None = None
+    wot_status: str
+    is_smith: bool
+    is_techcomm: bool
+
+
+class TokenResponse(BaseModel):
+    """Returned after successful challenge verification."""
+
+    token: str
+    identity: IdentityOut