dev_1.0.0_yuyr_2：重新提交 PR，增加 master/agent 以及系统集成测试 (#17)

Reviewed-on: #17
Reviewed-by: sundapeng <sundp@mail.zgclab.edu.cn>
Reviewed-by: xuxt <xuxt@zgclab.edu.cn>

src/master/app/config.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class AppConfig:
+    db_path: str
+    metric_nodes_json_path: str
+    offline_threshold_seconds: int
+    online_threshold_seconds: int
+    scheduler_interval_seconds: int
+    node_id_prefix: str
+    auth_mode: str
+
+
+def _get_int_env(name: str, default: int) -> int:
+    raw = os.environ.get(name)
+    if raw is None or raw.strip() == "":
+        return default
+    try:
+        return int(raw)
+    except ValueError as exc:
+        raise ValueError(f"Environment variable {name} must be an integer, got {raw!r}") from exc
+
+
+def load_config() -> AppConfig:
+    """读取环境变量生成配置对象，方便统一管理运行参数。"""
+    return AppConfig(
+        db_path=os.environ.get("DB_PATH", "/private/argus/master/db.sqlite3"),
+        metric_nodes_json_path=os.environ.get(
+            "METRIC_NODES_JSON_PATH", "/private/argus/metric/prometheus/nodes.json"
+        ),
+        offline_threshold_seconds=_get_int_env("OFFLINE_THRESHOLD_SECONDS", 180),
+        online_threshold_seconds=_get_int_env("ONLINE_THRESHOLD_SECONDS", 120),
+        scheduler_interval_seconds=_get_int_env("SCHEDULER_INTERVAL_SECONDS", 30),
+        node_id_prefix=os.environ.get("NODE_ID_PREFIX", "A"),
+        auth_mode=os.environ.get("AUTH_MODE", "disabled"),
+    )