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/components/capslock.py

@@ -0,0 +1,47 @@
+from fabric.widgets.label import Label
+from utils.utils import svg_file
+from .base import BaseOSDContainer
+from services.capslock import CapsLock
+
+
+class CapsLockOSDContainer(BaseOSDContainer):
+    def __init__(self, window, **kwargs):
+        super().__init__(window, **kwargs)
+        self.capslock = CapsLock.get_initial()
+        self._setup_specific_components()
+        self._connect_specific_signals()
+
+    def _setup_specific_components(self):
+        self.osd_image = svg_file(
+            "misc/caps-lock.svg",
+            size=(100, 100),
+            name="osd-image",
+            h_align="center",
+            v_align="center",
+            h_expand=True,
+            v_expand=True,
+        )
+        self.label = Label(name="osd-label")
+        self.add(self.osd_image)
+        self._update_display(self.capslock.is_on)
+
+    def _connect_specific_signals(self):
+        self.capslock.connect("state_changed", self._on_caps_lock_state_changed)
+
+    def _on_caps_lock_state_changed(self, _, is_on: bool):
+        self._update_display(is_on)
+        self.update()
+
+    def _update_display(self, is_on: bool):
+        icon_path = "caps-lock.svg" if is_on else "caps-lock-off.svg"
+        self.osd_image.set_from_file(f"misc/{icon_path}")
+        if is_on:
+            self.add_style_class("capslock-on")
+            self.remove_style_class("capslock-off")
+        else:
+            self.add_style_class("capslock-off")
+            self.remove_style_class("capslock-on")
+
+    def update(self, *_):
+        # We don't need a separate display update here as it's handled in the signal
+        super().update()