feat: Add 'Run on Startup' checkbox to system tray

This commit introduces a new feature that allows you to configure the application to run on startup.

- A "Run on Startup" checkbox has been added to the system tray menu.
- The application now uses a `config.json` file to store settings, including the "run on startup" state.
- On Windows, the application adds/removes itself from the startup programs by creating/deleting a key in the Windows Registry.

src/startup.py

@@ -0,0 +1,48 @@
+import os
+import winreg
+
+APP_NAME = "OopsWrongLang"
+RUN_BAT_PATH = os.path.abspath("run.bat")
+
+def add_to_startup():
+    """
+    Adds the application to Windows startup.
+    """
+    try:
+        key = winreg.HKEY_CURRENT_USER
+        sub_key = r"Software\Microsoft\Windows\CurrentVersion\Run"
+        with winreg.OpenKey(key, sub_key, 0, winreg.KEY_SET_VALUE) as registry_key:
+            winreg.SetValueEx(registry_key, APP_NAME, 0, winreg.REG_SZ, f'"{RUN_BAT_PATH}"')
+    except OSError as e:
+        print(f"Error adding to startup: {e}")
+
+def remove_from_startup():
+    """
+    Removes the application from Windows startup.
+    """
+    try:
+        key = winreg.HKEY_CURRENT_USER
+        sub_key = r"Software\Microsoft\Windows\CurrentVersion\Run"
+        with winreg.OpenKey(key, sub_key, 0, winreg.KEY_SET_VALUE) as registry_key:
+            winreg.DeleteValue(registry_key, APP_NAME)
+    except FileNotFoundError:
+        # This is fine, it means the key doesn't exist
+        pass
+    except OSError as e:
+        print(f"Error removing from startup: {e}")
+
+def is_in_startup():
+    """
+    Checks if the application is in Windows startup.
+    """
+    try:
+        key = winreg.HKEY_CURRENT_USER
+        sub_key = r"Software\Microsoft\Windows\CurrentVersion\Run"
+        with winreg.OpenKey(key, sub_key, 0, winreg.KEY_READ) as registry_key:
+            winreg.QueryValueEx(registry_key, APP_NAME)
+        return True
+    except FileNotFoundError:
+        return False
+    except OSError as e:
+        print(f"Error checking startup status: {e}")
+        return False