Add model base class and models

- Add Model base class with get_next_id() method
- Add Preset model with CRUD operations
- Add Profile model with tabs and palette support
- Add Group model for device grouping
- Add Sequence model for preset sequencing
- Add Tab model for organizing device controls
- Add Palette model for color collections

src/models/squence.py

@@ -0,0 +1,44 @@
+from models.model import Model
+
+class Sequence(Model):
+    def __init__(self):
+        super().__init__()
+
+    def create(self, group_name="", preset_names=None):
+        next_id = self.get_next_id()
+        self[next_id] = {
+            "group_name": group_name,
+            "presets": preset_names if preset_names else [],
+            "sequence_duration": 3000,  # Duration per preset in ms
+            "sequence_transition": 500,  # Transition time in ms
+            "sequence_loop": False,
+            "sequence_repeat_count": 0,  # 0 = infinite
+            "sequence_active": False,
+            "sequence_index": 0,
+            "sequence_start_time": 0
+        }
+        self.save()
+        return next_id
+
+    def read(self, id):
+        id_str = str(id)
+        return self.get(id_str, None)
+    
+    def update(self, id, data):
+        id_str = str(id)
+        if id_str not in self:
+            return False
+        self[id_str].update(data)
+        self.save()
+        return True
+    
+    def delete(self, id):
+        id_str = str(id)
+        if id_str not in self:
+            return False
+        self.pop(id_str)
+        self.save()
+        return True
+    
+    def list(self):
+        return list(self.keys())