Implement comprehensive project time logging feature

Add complete project management system with role-based access control:

**Core Features:**
- Project creation and management for Admins/Supervisors
- Time tracking with optional project selection and notes
- Project-based filtering and reporting in history
- Enhanced export functionality with project data
- Team-specific project assignments

**Database Changes:**
- New Project model with full relationships
- Enhanced TimeEntry model with project_id and notes
- Updated migration scripts with rollback support
- Sample project creation for testing

**User Interface:**
- Project management templates (create, edit, list)
- Enhanced time tracking with project dropdown
- Project filtering in history page
- Updated navigation for role-based access
- Modern styling with hover effects and responsive design

**API Enhancements:**
- Project validation and access control
- Updated arrive endpoint with project support
- Enhanced export functions with project data
- Role-based route protection

**Migration Support:**
- Comprehensive migration scripts (migrate_projects.py)
- Updated main migration script (migrate_db.py)
- Detailed migration documentation
- Rollback functionality for safe deployment

**Role-Based Access:**
- Admins: Full project CRUD operations
- Supervisors: Project creation and management
- Team Leaders: View team hours with projects
- Team Members: Select projects when tracking time

🤖 Generated with [Claude Code](https://claude.ai/code)

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

templates/admin_projects.html

@@ -0,0 +1,127 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<div class="timetrack-container">
+    <div class="admin-header">
+        <h2>Project Management</h2>
+        <a href="{{ url_for('create_project') }}" class="btn">Create New Project</a>
+    </div>
+    
+    {% if projects %}
+    <div class="projects-table">
+        <table class="time-history">
+            <thead>
+                <tr>
+                    <th>Code</th>
+                    <th>Name</th>
+                    <th>Team</th>
+                    <th>Status</th>
+                    <th>Start Date</th>
+                    <th>End Date</th>
+                    <th>Created By</th>
+                    <th>Time Entries</th>
+                    <th>Actions</th>
+                </tr>
+            </thead>
+            <tbody>
+                {% for project in projects %}
+                <tr class="{% if not project.is_active %}inactive-project{% endif %}">
+                    <td><strong>{{ project.code }}</strong></td>
+                    <td>{{ project.name }}</td>
+                    <td>
+                        {% if project.team %}
+                            {{ project.team.name }}
+                        {% else %}
+                            <em>All Teams</em>
+                        {% endif %}
+                    </td>
+                    <td>
+                        <span class="status-badge {% if project.is_active %}active{% else %}inactive{% endif %}">
+                            {{ 'Active' if project.is_active else 'Inactive' }}
+                        </span>
+                    </td>
+                    <td>{{ project.start_date.strftime('%Y-%m-%d') if project.start_date else '-' }}</td>
+                    <td>{{ project.end_date.strftime('%Y-%m-%d') if project.end_date else '-' }}</td>
+                    <td>{{ project.created_by.username }}</td>
+                    <td>{{ project.time_entries|length }}</td>
+                    <td class="actions">
+                        <a href="{{ url_for('edit_project', project_id=project.id) }}" class="btn btn-small">Edit</a>
+                        {% if g.user.role.name == 'ADMIN' and project.time_entries|length == 0 %}
+                        <form method="POST" action="{{ url_for('delete_project', project_id=project.id) }}" style="display: inline;" 
+                              onsubmit="return confirm('Are you sure you want to delete this project?')">
+                            <button type="submit" class="btn btn-small btn-danger">Delete</button>
+                        </form>
+                        {% endif %}
+                    </td>
+                </tr>
+                {% endfor %}
+            </tbody>
+        </table>
+    </div>
+    {% else %}
+    <div class="no-data">
+        <p>No projects found. <a href="{{ url_for('create_project') }}">Create your first project</a>.</p>
+    </div>
+    {% endif %}
+</div>
+
+<style>
+.admin-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 2rem;
+}
+
+.projects-table {
+    overflow-x: auto;
+}
+
+.inactive-project {
+    opacity: 0.6;
+}
+
+.status-badge {
+    padding: 0.25rem 0.5rem;
+    border-radius: 4px;
+    font-size: 0.875rem;
+    font-weight: 500;
+}
+
+.status-badge.active {
+    background-color: #d4edda;
+    color: #155724;
+}
+
+.status-badge.inactive {
+    background-color: #f8d7da;
+    color: #721c24;
+}
+
+.actions {
+    white-space: nowrap;
+}
+
+.btn-small {
+    padding: 0.375rem 0.75rem;
+    font-size: 0.875rem;
+    margin-right: 0.5rem;
+}
+
+.btn-danger {
+    background-color: #dc3545;
+    border-color: #dc3545;
+}
+
+.btn-danger:hover {
+    background-color: #c82333;
+    border-color: #bd2130;
+}
+
+.no-data {
+    text-align: center;
+    padding: 3rem;
+    color: #666;
+}
+</style>
+{% endblock %}