feat(backend): modèles SQLModel (10 tables)

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

backend/app/models/settings.py

@@ -0,0 +1,17 @@
+from datetime import date
+from typing import Optional
+from sqlmodel import Field, SQLModel
+
+
+class UserSettings(SQLModel, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    cle: str = Field(unique=True)
+    valeur: str
+
+
+class LunarCalendarEntry(SQLModel, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    jour: date = Field(unique=True)
+    phase: str  # nouvelle_lune | premier_quartier | pleine_lune | dernier_quartier | croissante | decroissante
+    type_jour: Optional[str] = None  # racine | feuille | fleur | fruit
+    lune_montante: Optional[bool] = None