feat(bot): Коммит — навигация по дереву репозитория загрузок

- UploadsRepo: локальный клон, fetch не чаще fetch_interval, ls-tree -z (пробелы/кириллица),
  cat-file, последний коммит по пути; git без shell, ssh с -F /dev/null (без конфига хоста)
- «📝 Коммит»: папки/файлы с размерами, ⬆️ Вверх, страницы по 20, карточка файла
  с последним коммитом, «👁 Показать» (<pre> или документом); в кнопках только индексы
- ключ для контейнера: GIT_SSH_KEY_B64 → временный файл 0600 (смонтированный файл хоста
  контейнерному uid не прочитать); volume /data для клона
- тесты на настоящем bare-репозитории во временной папке

Refs #8

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/conftest.py

@@ -1,3 +1,4 @@
+import subprocess
 from collections.abc import AsyncIterator
 from pathlib import Path
 
@@ -5,9 +6,10 @@ import pytest
 from sqlalchemy.ext.asyncio import AsyncEngine
 
 from app.access.service import AccessService
-from app.config import AccessSettings, RuntimeSettings, Settings, TelegramSettings
+from app.config import AccessSettings, GitSettings, RuntimeSettings, Settings, TelegramSettings
 from app.db.migrate import upgrade
 from app.db.session import SessionMaker, make_engine, make_sessionmaker
+from app.repo.git import UploadsRepo
 from app.texts import Texts, load_texts
 
 ROOT = Path(__file__).resolve().parent.parent
@@ -48,3 +50,44 @@ async def access(sessions: SessionMaker, settings: Settings) -> AccessService:
     service = AccessService(sessions, settings.access)
     await service.bootstrap_admins()
     return service
+
+
+def git(cwd: Path, *args: str) -> str:
+    env = {
+        "GIT_AUTHOR_NAME": "Тест",
+        "GIT_AUTHOR_EMAIL": "t@t",
+        "GIT_COMMITTER_NAME": "Тест",
+        "GIT_COMMITTER_EMAIL": "t@t",
+        "PATH": "/usr/bin:/bin",
+        "HOME": str(cwd),
+    }
+    return subprocess.run(["git", *args], cwd=cwd, env=env, check=True, capture_output=True, text=True).stdout
+
+
+@pytest.fixture
+def remote(tmp_path: Path) -> Path:
+    """A bare 'SourceCraft' repo: services/hello, a file with a space and Cyrillic, a binary, 25 files in one dir."""
+    work = tmp_path / "seed"
+    work.mkdir()
+    git(work, "init", "-q", "-b", "main")
+    (work / "services" / "hello").mkdir(parents=True)
+    (work / "services" / "hello" / "main.py").write_text("print('hello')\n", encoding="utf-8")
+    (work / "README.md").write_text("# uploads\n", encoding="utf-8")
+    git(work, "add", "-A")
+    git(work, "commit", "-q", "-m", "init")
+    (work / "docs").mkdir()
+    (work / "docs" / "мои заметки.md").write_text("привет\n", encoding="utf-8")
+    (work / "docs" / "logo.bin").write_bytes(b"\x00\x01\x02binary")
+    (work / "many").mkdir()
+    for i in range(25):
+        (work / "many" / f"f{i:02}.txt").write_text(str(i), encoding="utf-8")
+    git(work, "add", "-A")
+    git(work, "commit", "-q", "-m", "docs and many")
+    bare = tmp_path / "remote.git"
+    git(tmp_path, "clone", "-q", "--bare", str(work), str(bare))
+    return bare
+
+
+@pytest.fixture
+def repo(remote: Path, tmp_path: Path) -> UploadsRepo:
+    return UploadsRepo(GitSettings(uploads_url=str(remote), clone_dir=tmp_path / "clone", fetch_interval=0))