GRM-18: feat: make --ask-become-pass the default behavior

- Change --ask-become-pass from opt-in to opt-out across all commands
  (install, update, start, stop, enable, disable, status, remove)
- Use Click toggle pattern: --ask-become-pass/--no-ask-become-pass with
  default=True so users are always prompted for sudo unless they
  explicitly opt out
- Update i18n translations for both help texts
- Update all CLI tests to expect ask_become_pass=True as default and
  add test for --no-ask-become-pass
- Update README: remove --ask-become-pass from examples, document
  --no-ask-become-pass for passwordless-sudo setups
- 120 tests, 100% coverage, pyright clean, ruff clean

src/gitea_runner_manager/i18n.py

@@ -135,12 +135,19 @@ TRANSLATIONS: dict[str, dict[str, str]] = {
         "ru": "Повторы API интеграционного теста (по умолчанию: 3, env: GITEA_INTEGRATION_RETRIES)",
         "zh": "集成测试 API 重试次数（默认: 3，环境变量: GITEA_INTEGRATION_RETRIES）",
     },
-    "Prompt for sudo password": {
-        "en": "Prompt for sudo password",
-        "bg": "Подканване за sudo парола",
-        "de": "Nach sudo-Passwort fragen",
-        "ru": "Запросить пароль sudo",
-        "zh": "提示输入 sudo 密码",
+    "Prompt for sudo password (default)": {
+        "en": "Prompt for sudo password (default)",
+        "bg": "Подканване за sudo парола (по подразбиране)",
+        "de": "Nach sudo-Passwort fragen (Standard)",
+        "ru": "Запросить пароль sudo (по умолчанию)",
+        "zh": "提示输入 sudo 密码（默认）",
+    },
+    "Do not prompt for sudo password": {
+        "en": "Do not prompt for sudo password",
+        "bg": "Без подканване за sudo парола",
+        "de": "Nicht nach sudo-Passwort fragen",
+        "ru": "Не запрашивать пароль sudo",
+        "zh": "不提示输入 sudo 密码",
     },
     "Specific Gitea Runner version": {
         "en": "Specific Gitea Runner version",