feat(backend): ✨ rewrite mealplanner with simple api (#683)

* feat(backend): ✨ new meal-planner feature

* feat(frontend): ✨ new meal plan feature

* refactor(backend): ♻️ refactor base services classes and add mixins for crud

* feat(frontend): ✨ add UI/API for mealplanner

* feat(backend): ✨ add get_today and get_slice options for mealplanner

* test(backend): ✅ add and update group mealplanner tests

* fix(backend): 🐛 Fix recipe_id column type for PG

Co-authored-by: hay-kot <hay-kot@pm.me>

tests/unit_tests/validator_tests/test_create_plan_entry.py

@@ -0,0 +1,24 @@
+from datetime import date
+
+import pytest
+
+from mealie.schema.meal_plan.new_meal import CreatePlanEntry
+
+
+def test_create_plan_with_title():
+    entry = CreatePlanEntry(date=date.today(), title="Test Title")
+
+    assert entry.title == "Test Title"
+    assert entry.recipe_id is None
+
+
+def test_create_plan_with_slug():
+    entry = CreatePlanEntry(date=date.today(), recipe_id=123)
+
+    assert entry.recipe_id == 123
+    assert entry.title == ""
+
+
+def test_slug_or_title_validation():
+    with pytest.raises(ValueError):
+        CreatePlanEntry(date=date.today(), slug="", title="")