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/profile.py

@@ -0,0 +1,40 @@
+from models.model import Model
+
+class Profile(Model):
+    def __init__(self):
+        super().__init__()
+
+    def create(self, name=""):
+        next_id = self.get_next_id()
+        self[next_id] = {
+            "name": name,
+            "tabs": {},
+            "palette": [],
+            "tab_order": []
+        }
+        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())
+