Initial commit: Flask calorie counter app setup

Add base Flask application with user authentication, SQLAlchemy models for users, units, and food items, admin blueprint, and basic templates. Includes database migration setup, login form, and seed script for initial user creation.

app.py

@@ -0,0 +1,65 @@
+from flask import render_template, redirect, url_for
+from flask_login import (
+    login_required,
+    logout_user,
+    login_user,
+    current_user,
+)
+from forms import LoginForm
+from models import User
+from application import db, app, login_manager
+
+# Config
+app.config["SECRET_KEY"] = "Iman"
+
+login_manager.login_view = "login"  # type: ignore
+
+
+@login_manager.user_loader  # type: ignore
+def load_user(user_id: int):
+    return db.session.get(User, user_id)
+
+
+# Routes
+
+
+@app.route("/")
+def index():
+    return render_template("index.html")
+
+
+@app.route("/login", methods=["GET", "POST"])
+def login():
+    if current_user.is_authenticated:
+        return redirect(url_for("dashboard"))
+
+    form = LoginForm()
+    if form.validate_on_submit():
+        user = User.query.filter_by(username=form.username.data).first()
+        if user and user.check_password(password=form.password.data):
+            # User found and password correct
+            login_user(user)
+            return redirect(url_for("dashboard"))
+        else:
+            pass
+            # invalid user
+    return render_template("login.html", form=form)
+
+
+@app.route("/dashboard")
+@login_required
+def dashboard():
+    return render_template("dashboard.html", name=current_user.username)
+
+
+@app.route("/logout")
+@login_required
+def logout():
+    logout_user()
+    return redirect(url_for("index"))
+
+
+# Run
+
+if __name__ == "__main__":
+    app.run(debug=True)