fix(ci): AI Code Review fail-open - LLM失败/异常时不阻塞合并

修复两处违反fail-open原则的bug：
1. LLM调用失败返回None时 exit 1 → exit 0
2. 未捕获异常时 exit 1 → exit 0

fail-open原则：AI审查是辅助手段，不能因自身故障阻塞正常开发。

apps/api/app/middleware/auth.py

@@ -10,7 +10,7 @@ from __future__ import annotations
 from app.auth import AuthenticatedUser
 from app.auth import get_current_user as get_authenticated_user
 from app.dependencies import get_user_repository
-from fastapi import Depends, HTTPException
+from fastapi import Depends
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 
 from packages.domain.entities import User

pyproject.toml

@@ -5,45 +5,3 @@ target-version = ["py312"]
 [tool.isort]
 profile = "black"
 line_length = 120
-
-[tool.ruff]
-target-version = "py311"
-line-length = 120
-exclude = [
-  ".git",
-  "__pycache__",
-  ".venv",
-  "venv",
-  "node_modules",
-  "alembic",
-  ".gitea",
-  ".next",
-  "dist",
-  "build",
-  "hostexecutor",
-]
-
-[tool.ruff.lint]
-select = [
-  "E",   # pycodestyle errors（同 flake8 默认）
-  "F",   # pyflakes（同 flake8 默认）
-]
-ignore = [
-  "E203",
-  "E501",  # line-too-long（black管）
-  "E302",
-  "E402",  # module-import-not-at-top（循环导入多）
-  "E722",  # bare-except
-  "W291",
-  "W293",
-  "F401",
-  "F403",
-  "F405",
-  "F841",
-]
-
-[tool.ruff.lint.per-file-ignores]
-"__init__.py" = ["F401", "F403", "F405"]
-"tests/**" = ["E402", "F401", "F821", "F841"]
-"packages/ports/*" = ["E301"]
-"apps/api/app/api/routes/auth.py" = ["ALL"]