Add user dashboard and per-user food item ownership

Introduces a user dashboard route and template, moving dashboard logic to a user blueprint. FoodItem now has an owner_id field and a unique constraint on (barcode, owner_id), with relationships set up in the User model. Updates food item creation to associate with the current user, and adds a utility script for dropping a temporary table.

application/user/routes.py

@@ -0,0 +1,20 @@
+from flask import Blueprint, redirect, url_for, render_template
+from flask_login import current_user
+
+user_bp = Blueprint(
+    "user",
+    __name__,
+    template_folder="templates",
+)
+
+
+@user_bp.before_request
+def login_required():
+    if not current_user.is_authenticated:
+        return redirect(url_for("login"))
+
+
+@user_bp.route("/dashboard", methods=["GET"])
+def dashboard():
+    items = current_user.food_items.all()
+    return render_template("dashboard.html", items=items)

application/user/templates/dashboard.html

@@ -0,0 +1,47 @@
+{% extends "base.html" %}
+
+{% block title %}
+Food Nutritional Info
+{% endblock %}
+
+{% block content %}
+<div class="container mt-5">
+    <h1 class="mb-4">Food Nutritional Information (per 100g/100ml)</h1>
+    <div class="table-responsive">
+        <table class="table table-bordered table-hover align-middle">
+            <thead class="table-dark">
+                <tr>
+                    <th>Name</th>
+                    <th>Energy (kcal)</th>
+                    <th>Fats (g)</th>
+                    <th>Saturated Fats (g)</th>
+                    <th>Sugars (g)</th>
+                    <th>Carbs (g)</th>
+                    <th>Protein (g)</th>
+                    <th>Actions</th>
+                </tr>
+            </thead>
+            <tbody>
+                {% for food in items %}
+                <tr>
+                    <td class="bg-body-tertiary">{{ food.name }}</td>
+                    <td class="bg-body-tertiary">{{ food.energy_100g }}</td>
+                    <td class="bg-body-tertiary">{{ food.fats_100g }}</td>
+                    <td class="bg-body-tertiary">{{ food.saturated_fats_100g }}</td>
+                    <td class="bg-body-tertiary">{{ food.sugar_100g }}</td>
+                    <td class="bg-body-tertiary">{{ food.carbs_100g }}</td>
+                    <td class="bg-body-tertiary">{{ food.protein_100g }}</td>
+                    <td class="bg-body-tertiary">
+                        <form method="POST" action="{{ url_for('admin.delete_food', id=food.id) }}"
+                            onsubmit="return confirm('Are you sure you want to delete this item?');">
+                            <button type="submit" class="btn btn-danger btn-sm">Delete</button>
+                        </form>
+                    </td>
+                </tr>
+                {% endfor %}
+            </tbody>
+        </table>
+    </div>
+</div>
+
+{% endblock%}