Add blueprints for authentication, admin, dashboard, gallery, generation, and profile routes

- Created `__init__.py` for blueprint registration.
- Implemented `auth.py` for user authentication (login, register, logout).
- Added `admin.py` for admin functionalities (user management, stats).
- Developed `dashboard.py` for user dashboard displaying user info and generated content.
- Created `gallery.py` for managing and displaying images and videos.
- Implemented `generate.py` for text, image, and video generation functionalities.
- Added `profile.py` for user profile management.
- Updated templates to reflect new route structures and improve navigation.

frontend/app/routes/auth.py

@@ -0,0 +1,58 @@
+"""Auth blueprint — login, register, logout, index."""
+from flask import Blueprint, flash, redirect, render_template, request, session, url_for
+
+from ..helpers import _api
+
+auth_bp = Blueprint("auth", __name__)
+
+
+@auth_bp.get("/")
+def index():
+    if "access_token" in session:
+        return redirect(url_for("dashboard.index"))
+    return redirect(url_for("auth.login"))
+
+
+@auth_bp.route("/login", methods=["GET", "POST"])
+def login():
+    if request.method == "POST":
+        email = request.form["email"]
+        password = request.form["password"]
+        resp = _api("POST", "/auth/login",
+                    json={"email": email, "password": password})
+        if resp.status_code == 200:
+            data = resp.json()
+            session["access_token"] = data["access_token"]
+            session["refresh_token"] = data["refresh_token"]
+            me = _api("GET", "/users/me", token=data["access_token"])
+            if me.status_code == 200:
+                u = me.json()
+                session["user_email"] = u.get("email", "")
+                session["user_role"] = u.get("role", "user")
+            return redirect(url_for("dashboard.index"))
+        flash("Invalid email or password.", "error")
+    return render_template("login.html")
+
+
+@auth_bp.route("/register", methods=["GET", "POST"])
+def register():
+    if request.method == "POST":
+        email = request.form["email"]
+        password = request.form["password"]
+        resp = _api("POST", "/auth/register",
+                    json={"email": email, "password": password})
+        if resp.status_code == 201:
+            flash("Account created. Please log in.", "success")
+            return redirect(url_for("auth.login"))
+        detail = resp.json().get("detail", "Registration failed.")
+        flash(detail, "error")
+    return render_template("register.html")
+
+
+@auth_bp.get("/logout")
+def logout():
+    refresh_token = session.get("refresh_token")
+    if refresh_token:
+        _api("POST", "/auth/logout", json={"refresh_token": refresh_token})
+    session.clear()
+    return redirect(url_for("auth.login"))