feat(backend): modèles SQLModel (10 tables)

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

backend/app/models/plant.py

@@ -0,0 +1,35 @@
+from datetime import datetime
+from typing import Optional
+from sqlmodel import Field, SQLModel
+
+
+class PlantVariety(SQLModel, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    nom_commun: str
+    nom_botanique: Optional[str] = None
+    variete: Optional[str] = None
+    famille: Optional[str] = None
+    tags: Optional[str] = None  # CSV
+    type_plante: Optional[str] = None  # legume | fruit | aromatique | fleur
+    besoin_eau: Optional[str] = None  # faible | moyen | fort
+    besoin_soleil: Optional[str] = None
+    espacement_cm: Optional[int] = None
+    temp_min_c: Optional[float] = None
+    duree_culture_j: Optional[int] = None
+    profondeur_semis_cm: Optional[float] = None
+    sol_conseille: Optional[str] = None
+    semis_interieur_mois: Optional[str] = None  # ex: "2,3"
+    semis_exterieur_mois: Optional[str] = None
+    repiquage_mois: Optional[str] = None
+    plantation_mois: Optional[str] = None
+    recolte_mois: Optional[str] = None
+    notes: Optional[str] = None
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+
+
+class PlantImage(SQLModel, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    variety_id: int = Field(foreign_key="plantvariety.id", index=True)
+    filename: str
+    caption: Optional[str] = None
+    created_at: datetime = Field(default_factory=datetime.utcnow)