feat: implement meal planning feature with CRUD operations and UI integration

backend/src/meal-plan/meal-plan.controller.ts

@@ -0,0 +1,28 @@
+import { Body, Controller, Delete, Get, Param, Post, Query } from '@nestjs/common';
+import { MealPlanService } from './meal-plan.service';
+import { CreateMealPlanEntryDto } from './dto/create-meal-plan-entry.dto';
+
+@Controller('meal-plan')
+export class MealPlanController {
+  constructor(private readonly mealPlanService: MealPlanService) {}
+
+  @Get()
+  findByRange(@Query('from') from: string, @Query('to') to: string) {
+    return this.mealPlanService.findByRange(from, to);
+  }
+
+  @Get('shopping-list')
+  shoppingList(@Query('from') from: string, @Query('to') to: string) {
+    return this.mealPlanService.shoppingList(from, to);
+  }
+
+  @Post()
+  upsert(@Body() dto: CreateMealPlanEntryDto) {
+    return this.mealPlanService.upsert(dto);
+  }
+
+  @Delete(':date')
+  removeByDate(@Param('date') date: string) {
+    return this.mealPlanService.removeByDate(date);
+  }
+}