feat: initialize project structure and configuration

- Create backend directory structure (app/models, app/schemas, app/services, app/api, app/tasks, tests)
- Create frontend directory structure (src/router, src/views, src/components, src/api, src/stores)
- Create data directories (ssh_keys, repos)
- Add requirements.txt with FastAPI, SQLAlchemy, Pydantic, and testing dependencies
- Add frontend package.json with Vue 3, Vue Router, Pinia, and Element Plus
- Add .env.example with configuration template
- Add .gitignore for Python, data directories, and frontend
- Add pytest conftest.py with test fixtures for database and environment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/tests/conftest.py

@@ -0,0 +1,55 @@
+import os
+import sys
+import tempfile
+import pytest
+from pathlib import Path
+
+# Add backend to path
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from app.models import Base
+
+
+@pytest.fixture(scope="function")
+def db_path(tmp_path):
+    """临时数据库路径."""
+    return tmp_path / "test.db"
+
+
+@pytest.fixture(scope="function")
+def db_engine(db_path):
+    """临时数据库引擎."""
+    engine = create_engine(f"sqlite:///{db_path}", connect_args={"check_same_thread": False})
+    Base.metadata.create_all(engine)
+    yield engine
+    engine.dispose()
+
+
+@pytest.fixture(scope="function")
+def db_session(db_engine):
+    """临时数据库会话."""
+    SessionLocal = sessionmaker(bind=db_engine, autocommit=False, autoflush=False)
+    session = SessionLocal()
+    yield session
+    session.close()
+
+
+@pytest.fixture(scope="function")
+def test_encrypt_key():
+    """测试加密密钥."""
+    import base64
+    return base64.b64encode(b'test-key-32-bytes-long-1234567890').decode()
+
+
+@pytest.fixture(scope="function")
+def test_env_vars(db_path, test_encrypt_key, monkeypatch):
+    """设置测试环境变量."""
+    monkeypatch.setenv("GM_ENCRYPT_KEY", test_encrypt_key)
+    monkeypatch.setenv("GM_API_TOKEN", "test-token")
+    monkeypatch.setenv("GM_DATA_DIR", str(db_path.parent))
+    return {
+        "GM_ENCRYPT_KEY": test_encrypt_key,
+        "GM_API_TOKEN": "test-token",
+    }