Add NextSnap PWA with photo gallery viewer and continuous capture

Offline-first photo capture app for Nextcloud with:
- Camera capture with continuous mode (auto-reopens after each photo)
- File browser with fullscreen image gallery, swipe navigation, and rename
- Upload queue with background sync engine
- Admin panel for Nextcloud user management
- Service worker for offline-first caching (v13)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/routes/views.py

@@ -0,0 +1,84 @@
+from flask import Blueprint, render_template, redirect, url_for, session, jsonify
+
+bp = Blueprint('views', __name__)
+
+@bp.route('/')
+def index():
+    """Root route - redirect to capture if logged in, otherwise show login."""
+    if 'username' in session:
+        return redirect(url_for('views.capture'))
+    return render_template('login.html')
+
+@bp.route('/login')
+def login_page():
+    """Render login page."""
+    if 'username' in session:
+        return redirect(url_for('views.capture'))
+    return render_template('login.html')
+
+@bp.route('/capture')
+def capture():
+    """Render capture page (requires authentication)."""
+    if 'username' not in session:
+        return redirect(url_for('views.login_page'))
+    return render_template(
+        'capture.html',
+        username=session['username'],
+        show_nav=True,
+        is_admin=session.get('is_admin', False)
+    )
+
+@bp.route('/queue')
+def queue():
+    """Render queue page (requires authentication)."""
+    if 'username' not in session:
+        return redirect(url_for('views.login_page'))
+    return render_template(
+        'queue.html',
+        username=session['username'],
+        show_nav=True,
+        is_admin=session.get('is_admin', False)
+    )
+
+@bp.route('/browser')
+def browser():
+    """Render file browser page (requires authentication)."""
+    if 'username' not in session:
+        return redirect(url_for('views.login_page'))
+    return render_template(
+        'browser.html',
+        username=session['username'],
+        show_nav=True,
+        is_admin=session.get('is_admin', False)
+    )
+
+@bp.route('/reviewer')
+def reviewer():
+    """Render photo reviewer page (requires authentication)."""
+    if 'username' not in session:
+        return redirect(url_for('views.login_page'))
+    return render_template(
+        'reviewer.html',
+        username=session['username'],
+        show_nav=False,
+        is_admin=session.get('is_admin', False)
+    )
+
+@bp.route('/admin')
+def admin():
+    """Render admin page (requires admin privileges)."""
+    if 'username' not in session:
+        return redirect(url_for('views.login_page'))
+    if not session.get('is_admin', False):
+        return "Access denied: Admin privileges required", 403
+    return render_template(
+        'admin.html',
+        username=session['username'],
+        show_nav=True,
+        is_admin=True
+    )
+
+@bp.route('/test')
+def test():
+    """Test page for camera functionality."""
+    return render_template('test.html')