feat: 15.0 - Backend - Delete habit endpoint

dashboard/api.py

@@ -166,6 +166,12 @@ class TaskBoardHandler(SimpleHTTPRequestHandler):
         else:
             self.send_error(404)
     
+    def do_DELETE(self):
+        if self.path.startswith('/api/habits/'):
+            self.handle_habits_delete()
+        else:
+            self.send_error(404)
+    
     def handle_git_commit(self):
         """Run git commit and push."""
         try:
@@ -988,6 +994,59 @@ class TaskBoardHandler(SimpleHTTPRequestHandler):
         except Exception as e:
             self.send_json({'error': str(e)}, 500)
     
+    def handle_habits_delete(self):
+        """Delete a habit by ID."""
+        try:
+            # Extract habit ID from path: /api/habits/{id}
+            path_parts = self.path.split('/')
+            if len(path_parts) < 4:
+                self.send_json({'error': 'Invalid path'}, 400)
+                return
+            
+            habit_id = path_parts[3]  # /api/habits/{id} -> index 3 is id
+            
+            # Read habits file
+            habits_file = KANBAN_DIR / 'habits.json'
+            if not habits_file.exists():
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            try:
+                habits_data = json.loads(habits_file.read_text(encoding='utf-8'))
+            except (json.JSONDecodeError, IOError):
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            # Find the habit by ID
+            habit_index = None
+            for i, h in enumerate(habits_data.get('habits', [])):
+                if h.get('id') == habit_id:
+                    habit_index = i
+                    break
+            
+            if habit_index is None:
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            # Remove the habit
+            deleted_habit = habits_data['habits'].pop(habit_index)
+            
+            # Update lastUpdated timestamp
+            habits_data['lastUpdated'] = datetime.now().isoformat()
+            
+            # Write back to file
+            habits_file.write_text(json.dumps(habits_data, indent=2), encoding='utf-8')
+            
+            # Return 200 OK with success message
+            self.send_json({
+                'success': True,
+                'message': 'Habit deleted successfully',
+                'id': habit_id
+            }, 200)
+            
+        except Exception as e:
+            self.send_json({'error': str(e)}, 500)
+    
     def handle_files_get(self):
         """List files or get file content."""
         from urllib.parse import urlparse, parse_qs