feat: 核心模块增强 — 加密 + 运行时配置 + 日志缓冲

- crypto.py: API Key 加密/解密工具
- runtime_config.py: 运行时动态配置管理
- log_buffer.py: 内存日志缓冲区
- config.py: 新增加密配置项
- http_client.py: 增强重试和错误处理

pyproject.toml

@@ -12,6 +12,8 @@ dependencies = [
     "asyncpg>=0.29",
     "psycopg2-binary>=2.9",
     "httpx>=0.27",
+    "alembic>=1.13",
+    "cryptography>=42.0",
 ]
 
 [project.optional-dependencies]
@@ -19,6 +21,8 @@ dev = [
     "pytest>=8.0",
     "pytest-asyncio>=0.23",
     "httpx>=0.27",
+    "alembic>=1.13",
+    "cryptography>=42.0",
 ]
 
 [build-system]