chore: initial commit — leaudit-platform project skeleton

17-table PostgreSQL schema with full Chinese column comments,
FastAPI project structure (admin/common/modules),
DSL rule files, and schema migration scripts.

fastapi_admin/config/_loader.py

@@ -0,0 +1,68 @@
+"""配置加载器 —— 读取 TOML 文件并注入 os.environ。
+
+加载顺序（后覆盖前）：
+1. app.toml           — 基础配置
+2. app.{APP_ENV}.toml — 环境差异
+3. app.ai.toml        — AI 专用（最高 TOML 优先级）
+4. 已有环境变量        — 不覆盖（最高优先级）
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+
+_ROOT = Path(__file__).resolve().parents[2]
+
+
+def _find_project_root() -> Path:
+    """查找项目根目录（包含 app.toml 的目录）。"""
+    return _ROOT
+
+
+def _load_toml(path: Path) -> dict:
+    """读取 TOML 文件并展平 [SECTION].KEY → SECTION_KEY。"""
+    try:
+        import tomllib
+    except ImportError:
+        import tomli as tomllib
+
+    with open(path, "rb") as fh:
+        data = tomllib.load(fh)
+
+    flat: dict[str, str] = {}
+    for section, values in data.items():
+        if not isinstance(values, dict):
+            continue
+        for key, val in values.items():
+            env_key = f"{section.upper()}_{key.upper()}"
+            if isinstance(val, list):
+                flat[env_key] = ",".join(str(v) for v in val)
+            elif isinstance(val, bool):
+                flat[env_key] = str(val).lower()
+            elif val is not None:
+                flat[env_key] = str(val)
+    return flat
+
+
+def load_config() -> None:
+    """加载所有 TOML 配置到 os.environ（不覆盖已有环境变量）。"""
+    root = _find_project_root()
+
+    env = os.getenv("APP_ENV", "development")
+    toml_files = [
+        root / "app.toml",
+        root / f"app.{env}.toml",
+        root / "app.ai.toml",
+    ]
+
+    for toml_path in toml_files:
+        if not toml_path.exists():
+            continue
+        for key, value in _load_toml(toml_path).items():
+            os.environ.setdefault(key, value)
+
+    # 确保项目根在 sys.path 中
+    if str(root) not in sys.path:
+        sys.path.insert(0, str(root))