feat(root): implement dynamic todo list refresh and UI enhancements

This change adds a mechanism to refresh the todo list dynamically when the underlying service updates, improving UI responsiveness and user experience. It also updates documentation and removes deprecated files.

- New Features:
  - Added `_refresh_todos` method to rebuild the todo list when `get_todo_service().todos` changes.
  - Introduced `TodoListCapture` class for mouse capture handling of the todo list window.
- Enhancements:
  - Updated README with corrected image paths, installation tips, and manual installation commands.
  - Introduced `start.py` to launch the application or lock mode.
  - Removed deprecated `config.json` and `debug_memory.py`.
- Bug Fixes:
  - Fixed lock screen screenshot path in README.

src/window/osd/main.py

@@ -0,0 +1,83 @@
+from fabric.widgets.box import Box
+from fabric.widgets.revealer import Revealer
+from fabric.widgets.wayland import WaylandWindow as Window
+from .components import (
+    AudioOSDContainer,
+    BrightnessOSDContainer,
+    MicrophoneOSDContainer,
+    CapsLockOSDContainer,
+    KeyboardLayoutOSDContainer,
+)
+
+
+class OSD(Box):
+    def __init__(self, window: Window, **kwargs):
+        super().__init__(name="osd", **kwargs)
+        self.window = window
+
+        self.revealer = Revealer(
+            transition_type="slide-up",
+            transition_duration=100,
+            child_revealed=False,
+        )
+        self.children = [self.revealer]
+
+        self.containers = {
+            "audio": AudioOSDContainer(window),
+            "brightness": BrightnessOSDContainer(window),
+            "microphone": MicrophoneOSDContainer(window),
+            "capslock": CapsLockOSDContainer(window),
+            "kb_layout": KeyboardLayoutOSDContainer(window),
+        }
+
+        # Set the OSD reference in containers
+        for container in self.containers.values():
+            container.osd = self
+
+        self.current_container = None
+
+    def show_container(self, container):
+        if self.current_container != container:
+            self.revealer.children = [container]
+            self.current_container = container
+        self.revealer.set_reveal_child(True)
+
+    def show_audio_osd(self):
+        self.show_container(self.containers.get("audio"))
+
+    def show_brightness_osd(self):
+        self.show_container(self.containers.get("brightness"))
+
+    def show_microphone_osd(self):
+        self.show_container(self.containers.get("microphone"))
+
+    def show_capslock_osd(self):
+        self.show_container(self.containers.get("capslock"))
+
+    def show_kb_layout_osd(self):
+        self.show_container(self.containers.get("kb_layout"))
+
+
+class OSDWindow(Window):
+    def __init__(self, **kwargs):
+        super().__init__(
+            name="osd-window",
+            title="modus-osd",
+            anchor="bottom",
+            margin="0px 0px 40px 0px",
+            visible=False,
+            all_visible=False,
+            pass_through=True,
+            layer="overlay",
+            **kwargs,
+        )
+        self.osd = OSD(window=self)
+        self.add(self.osd)
+
+
+if __name__ == "__main__":
+    from fabric import Application
+
+    osd_window = OSDWindow()
+    app = Application("modus-osd", osd_window)
+    app.run()