Add barcode scanning and meal selection features

Introduces a barcode scanner page using the camera for food item entry, adds routes for selecting meal types and scanning products, and updates the test.html template to allow adding items to specific meals. Also updates branding in base.html, changes the Flask secret key, and enables SSL by default in app.py.

application/user/routes.py

@@ -1,4 +1,13 @@
-from flask import Blueprint, redirect, url_for, render_template, flash
+from flask import (
+    Blueprint,
+    redirect,
+    url_for,
+    render_template,
+    flash,
+    session,
+    jsonify,
+    abort,
+)
 from flask_login import current_user
 from application import db
 from forms import FoodItemForm, FoodLogForm
@@ -177,14 +186,44 @@ def overview():
     return render_template("overview.html")
 
 
+@user_bp.route("/select_meal/<int:meal_type>", methods=["GET"])
+def select_meal(meal_type: int):
+    assert type(meal_type) is int
+    session["meal_type"] = meal_type
+    return redirect(url_for("user.scan_product"))
+
+
+@user_bp.route("/get_userid", methods=["GET"])
+def scan_product():
+    return render_template("get_item.html")
+
+
+@user_bp.route("/add_meal", methods=["GET"])
+def add_meal():
+    meal_type = session["meal_type"]
+    if meal_type is None:
+        return redirect("/")
+    return render_template("scan.html")
+
+
 @user_bp.route("/", methods=["GET"])
 def test():
     today = datetime.now(timezone.utc).date()
     logs_today = current_user.food_logs.filter_by(date_=today).all()
-    logs = {0: [], 1: [], 2: [], 3: []}
+    logs = [[], [], [], []]
     for log in logs_today:
         logs[log.part_of_day].append(log)
     print(logs)
     return render_template(
         "test.html", date=(today.strftime("%d/%m/%y")), logs=logs
     )
+
+
+@user_bp.route("/foodId_from_barcode/<string:barcode>", methods=["GET"])
+def foodId_from_barcode(barcode: str):
+    if barcode.isdigit():
+        return jsonify({"food_id": barcode})
+    else:
+        return abort(
+            400, description="Invalid barcode: must contain only digits"
+        )