Refonte design : 4 humeurs, onboarding, sections avec boite a outils

- Systeme de themes adaptatifs : Peps (light chaud), Zen (light calme),
  Chagrine (dark violet), Grave (dark ambre) avec CSS custom properties
- Dashboard d'accueil orienté onboarding avec cartes-portes et teaser
  boite a outils
- SectionLayout reutilisable : liste + sidebar toolbox + status pills
  cliquables (En prepa / En vote / En vigueur / Clos)
- ToolboxVignette : vignettes Contexte / Tutos / Choisir / Demarrer
- Seed : Acte engagement certification + forgeron, Runtime Upgrade
  (decision on-chain), 3 modalites de vote (majoritaire, quadratique,
  permanent)
- Backend adapte SQLite (Uuid portable, 204 fix, pool conditionnel)
- Correction noms composants (pathPrefix: false), pinia/nuxt ^0.11

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

backend/app/models/sanctuary.py

@@ -1,8 +1,7 @@
 import uuid
 from datetime import datetime
 
-from sqlalchemy import String, Integer, Text, DateTime, func
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy import String, Integer, Text, DateTime, Uuid, func
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.database import Base
@@ -11,9 +10,9 @@ from app.database import Base
 class SanctuaryEntry(Base):
     __tablename__ = "sanctuary_entries"
 
-    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
     entry_type: Mapped[str] = mapped_column(String(64), nullable=False)  # document, decision, vote_result
-    reference_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+    reference_id: Mapped[uuid.UUID] = mapped_column(Uuid, nullable=False)
     title: Mapped[str | None] = mapped_column(String(256))
     content_hash: Mapped[str] = mapped_column(String(128), nullable=False)  # SHA-256
     ipfs_cid: Mapped[str | None] = mapped_column(String(128))