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/services/blockchain_service.py

@@ -0,0 +1,87 @@
+"""Blockchain service: retrieve on-chain data from Duniter V2.
+
+Provides functions to query WoT size, Smith sub-WoT size, and
+Technical Committee size from the Duniter V2 blockchain.
+
+Currently stubbed with hardcoded values matching GDev test data.
+"""
+
+from __future__ import annotations
+
+
+async def get_wot_size() -> int:
+    """Return the current number of WoT members.
+
+    TODO: Implement real RPC call using substrate-interface::
+
+        from substrateinterface import SubstrateInterface
+        from app.config import settings
+
+        substrate = SubstrateInterface(url=settings.DUNITER_RPC_URL)
+
+        # Query membership count
+        result = substrate.query(
+            module="Membership",
+            storage_function="MembershipCount",
+        )
+        return int(result.value)
+
+    Returns
+    -------
+    int
+        Number of WoT members. Currently returns 7224 (GDev snapshot).
+    """
+    # TODO: Replace with real substrate-interface RPC call
+    return 7224
+
+
+async def get_smith_size() -> int:
+    """Return the current number of Smith members (forgerons).
+
+    TODO: Implement real RPC call using substrate-interface::
+
+        from substrateinterface import SubstrateInterface
+        from app.config import settings
+
+        substrate = SubstrateInterface(url=settings.DUNITER_RPC_URL)
+
+        # Query Smith membership count
+        result = substrate.query(
+            module="SmithMembers",
+            storage_function="SmithMembershipCount",
+        )
+        return int(result.value)
+
+    Returns
+    -------
+    int
+        Number of Smith members. Currently returns 20 (GDev snapshot).
+    """
+    # TODO: Replace with real substrate-interface RPC call
+    return 20
+
+
+async def get_techcomm_size() -> int:
+    """Return the current number of Technical Committee members.
+
+    TODO: Implement real RPC call using substrate-interface::
+
+        from substrateinterface import SubstrateInterface
+        from app.config import settings
+
+        substrate = SubstrateInterface(url=settings.DUNITER_RPC_URL)
+
+        # Query TechComm member count
+        result = substrate.query(
+            module="TechnicalCommittee",
+            storage_function="Members",
+        )
+        return len(result.value) if result.value else 0
+
+    Returns
+    -------
+    int
+        Number of TechComm members. Currently returns 5 (GDev snapshot).
+    """
+    # TODO: Replace with real substrate-interface RPC call
+    return 5