feat: add config manager module with YAML loading for settings and services

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

backend/modules/config_manager.py

@@ -0,0 +1,44 @@
+from pathlib import Path
+from typing import Any
+
+import yaml
+
+
+class ConfigManager:
+    def __init__(self, settings_path: str, services_path: str):
+        self._settings_path = settings_path
+        self._services_path = services_path
+        self._settings: dict[str, Any] = {}
+        self._services: dict[str, Any] = {}
+
+    def _load_yaml(self, path: str) -> dict[str, Any]:
+        p = Path(path)
+        if not p.exists():
+            return {}
+        with open(p) as f:
+            return yaml.safe_load(f) or {}
+
+    def get_settings(self) -> dict[str, Any]:
+        if not self._settings:
+            self._settings = self._load_yaml(self._settings_path)
+        return self._settings
+
+    def get_nodes(self) -> list[dict[str, Any]]:
+        if not self._services:
+            self._services = self._load_yaml(self._services_path)
+        return self._services.get("nodes", [])
+
+    def get_node_by_ip(self, ip: str) -> dict[str, Any] | None:
+        for node in self.get_nodes():
+            if node.get("ip") == ip:
+                return node
+        return None
+
+    def get_network_scan_config(self) -> dict[str, Any]:
+        if not self._services:
+            self._services = self._load_yaml(self._services_path)
+        return self._services.get("network_scan", {})
+
+    def reload(self) -> None:
+        self._settings = {}
+        self._services = {}