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/model.py

@@ -0,0 +1,42 @@
+import json
+import wifi
+import ubinascii
+import machine
+
+class Model(dict):
+    
+    def __init__(self):
+        self.file = self.__class__.__name__ + ".json"
+        super().__init__()
+
+        self.load()  # Load settings from file during initialization
+
+    def set_defaults(self):
+        self = {}
+
+    def get_next_id(self):
+        """Get the next available ID for creating a new record."""
+        if not self:
+            return "1"
+        max_id = max((int(k) for k in self.keys() if k.isdigit()), default=0)
+        return str(max_id + 1)
+
+    def save(self):
+        try:
+            j = json.dumps(self)
+            with open(self.file, 'w') as file:
+                file.write(j)
+            print("Settings saved successfully.")
+        except Exception as e:
+            print(f"Error saving settings: {e}")
+
+    def load(self):
+        try:
+            with open(self.file, 'r') as file:
+                loaded_settings = json.load(file)
+            self.update(loaded_settings)
+            print("Settings loaded successfully.")
+        except Exception as e:
+            print(f"Error loading settings")
+            self.set_defaults()
+            self.save()