feat(backend): CRUD jardins + tests

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

backend/app/main.py

@@ -27,6 +27,17 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+from app.routers import gardens, varieties, plantings, tasks, settings, media
+
+app.include_router(gardens.router, prefix="/api")
+app.include_router(varieties.router, prefix="/api")
+app.include_router(plantings.router, prefix="/api")
+app.include_router(tasks.router, prefix="/api")
+app.include_router(settings.router, prefix="/api")
+app.include_router(media.router, prefix="/api")
+
+# Note: le mount StaticFiles sera ajouté ici dans Task 6
+
 
 @app.get("/api/health")
 def health():