feat: 작업 관리 시스템 및 TBM 공정/작업 통합

## Backend Changes
- Create tasks table with work_type_id FK to work_types
- Add taskModel, taskController, taskRoutes for task CRUD
- Update tbmModel to support work_type_id and task_id
- Add migrations for tasks table and TBM integration

## Frontend Changes
- Create task management admin page (tasks.html, task-management.js)
- Update TBM modal to include work type (공정) and task (작업) selection
- Add cascading dropdown: work type → task selection
- Display work type and task info in TBM session cards
- Update sidebar navigation in all admin pages

## Database Schema
- tasks: task_id, work_type_id, task_name, description, is_active
- tbm_sessions: add work_type_id, task_id columns with FKs
- Foreign keys maintain referential integrity with work_types and tasks

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

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

web-ui/pages/work/tbm.html

@@ -177,6 +177,21 @@
                         </div>
                     </div>
 
+                    <div class="form-row">
+                        <div class="form-group">
+                            <label class="form-label">공정 (Work Type) *</label>
+                            <select id="workTypeId" class="form-control" onchange="loadTasksByWorkType()" required>
+                                <option value="">공정 선택...</option>
+                            </select>
+                        </div>
+                        <div class="form-group">
+                            <label class="form-label">작업 (Task) *</label>
+                            <select id="taskId" class="form-control" required>
+                                <option value="">작업 선택...</option>
+                            </select>
+                        </div>
+                    </div>
+
                     <div class="form-group">
                         <label class="form-label">작업 내용</label>
                         <textarea id="workDescription" class="form-control" rows="3" placeholder="오늘 진행할 작업 내용을 입력하세요"></textarea>