Integrate Bootstrap 5 and Bootstrap Icons into UI

- Add Bootstrap 5.3.3 + Icons via CDN to base.html
- Replace 315-line hand-written CSS with 35-line brand overrides
- Update all 13 templates with Bootstrap utility classes:
  - Responsive navbar with mobile hamburger menu
  - Consistent card-based layout for forms and profile
  - Proper button alignment with d-flex and d-grid utilities
  - List groups for data display (profile info)
  - Professional alerts and icons
- No backend changes, no build toolchain needed
- Responsive design works on mobile/tablet/desktop

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

web/templates/profile_view.html

@@ -0,0 +1,46 @@
+{% extends "base.html" %}
+{% block title %}Личный кабинет — EvoSync{% endblock %}
+
+{% block content %}
+<div class="row justify-content-center">
+    <div class="col-sm-10 col-md-7 col-lg-6">
+        <div class="card shadow-sm mt-4">
+            <div class="card-header">
+                <h1 class="h5 mb-0"><i class="bi bi-person-circle me-2"></i>Личный кабинет</h1>
+            </div>
+            <ul class="list-group list-group-flush">
+                <li class="list-group-item d-flex justify-content-between">
+                    <span class="text-muted small">Имя</span>
+                    <span>{{ user.first_name }}</span>
+                </li>
+                <li class="list-group-item d-flex justify-content-between">
+                    <span class="text-muted small">Фамилия</span>
+                    <span>{{ user.last_name }}</span>
+                </li>
+                <li class="list-group-item d-flex justify-content-between">
+                    <span class="text-muted small">Email</span>
+                    <span>{{ user.email }}</span>
+                </li>
+                <li class="list-group-item d-flex justify-content-between">
+                    <span class="text-muted small">Телефон</span>
+                    <span>{{ user.phone }}</span>
+                </li>
+            </ul>
+            <div class="card-body d-grid gap-2">
+                <a href="/profile/edit" class="btn btn-primary">
+                    <i class="bi bi-pencil me-1"></i>Редактировать профиль
+                </a>
+                <a href="/profile/change-password" class="btn btn-secondary">
+                    <i class="bi bi-key me-1"></i>Изменить пароль
+                </a>
+                <a href="/logout" class="btn btn-outline-secondary">
+                    <i class="bi bi-box-arrow-right me-1"></i>Выход
+                </a>
+                <a href="/profile/delete" class="btn btn-outline-danger btn-sm mt-2">
+                    <i class="bi bi-trash me-1"></i>Удалить аккаунт
+                </a>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}