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/shared/styles/switcher.css

@@ -0,0 +1,48 @@
+#application-switcher-container {
+    background-color: var(--shadow);
+    border-radius: 20px;
+    padding: 24px;
+}
+
+#application-switcher-view {
+    padding: 0px;
+    margin-bottom: 12px;
+}
+
+#switcher-button {
+    padding: 12px;
+    min-width: 100px;
+    transition: all 0.2s ease;
+}
+
+#window-button {
+    background-color: transparent;
+    border-radius: 12px;
+}
+
+#window-button.active {
+    background-color: var(--surface);
+}
+
+.switcher-selection-label {
+    color: var(--foreground);
+    font-size: 16px;
+    font-weight: 600;
+    margin-top: 8px;
+}
+
+.switcher-workspace-label {
+    color: var(--foreground);
+    opacity: 0.6;
+    font-size: 12px;
+    margin-top: 4px;
+}
+
+#switcher-icon-box {
+    border-radius: 12px;
+    padding: 4px;
+}
+
+#window-row {
+    padding: 0px;
+}