feat(backend): recipe enrichment with side dishes & detailed instructions

- Add SideDish/SideDishIngredient schemas and recipe.side_dishes JSONB column
- Add recipe_enrichment.py service using Ollama LLM to:
  - Rewrite vague instructions with specific temps, quantities, timing, sauce breakdowns
  - Suggest 1-2 complementary side dishes with ingredients & prep notes
- Wire enrichment into recipe_ingestion.py discovery pipeline
- Add admin trigger endpoint /api/recipes/{id}/enrich for on-demand enrichment
- Migration 0014: Add side_dishes JSONB to recipe table
- Fix schemas/__init__.py imports: restore RecipeBase/Create/Read exports, add datetime/date for PydanticOptional compatibility
- Deployed to docker-willester and migrated to alembic 0014

backend/app/api/recipes.py

@@ -60,6 +60,7 @@ def _serialize(row: Recipe) -> dict:
         "spice_level": row.spice_level,
         "calories_per_serving": row.calories_per_serving,
         "ingredients": row.ingredients or [],
+        "side_dishes": row.side_dishes or [],
         "instructions": list(row.instructions or []),
         "source_url": row.source_url,
         "external_source": row.external_source,