refactor: config/apps 目录重组、文档重构、架构图收窄

- 中央：config/(prometheus,alertmanager,grafana)、apps/(tile-cache,topology-editor)
- 边缘：config/(vmagent,blackbox,targets)、apps/(onvif-exporter)
- env: TRAEFIK_PROVIDER、prometheus/env.example 详细说明
- 文档：README/doc 重构，EDGE_CACHE 合并到 EDGE_AGENT_CONFIG
- targets.csv 更新流程说明，ARCHITECTURE 图收窄

Made-with: Cursor

central-server/config/prometheus/alert_rules.yml

@@ -0,0 +1,49 @@
+groups:
+- name: onvif_alerts
+  rules:
+  - alert: ONVIFDeviceDown
+    expr: up{job="onvif-devices"} == 0
+    for: 1m
+    labels:
+      severity: critical
+    annotations:
+      summary: "ONVIF设备离线"
+      description: "ONVIF设备 {{ $labels.instance }} 已离线超过1分钟"
+
+  - alert: ONVIFDeviceHighTemperature
+    expr: onvif_device_temperature > 70
+    for: 2m
+    labels:
+      severity: warning
+    annotations:
+      summary: "ONVIF设备温度过高"
+      description: "设备 {{ $labels.instance }} 温度达到 {{ $value }}°C"
+
+  - alert: ONVIFDeviceLowStorage
+    expr: onvif_storage_usage_percent > 90
+    for: 5m
+    labels:
+      severity: warning
+    annotations:
+      summary: "ONVIF设备存储空间不足"
+      description: "设备 {{ $labels.instance }} 存储使用率达到 {{ $value }}%"
+
+- name: network_alerts
+  rules:
+  - alert: NetworkDeviceDown
+    expr: probe_success{job="network-ping"} == 0
+    for: 2m
+    labels:
+      severity: critical
+    annotations:
+      summary: "网络设备离线"
+      description: "网络设备 {{ $labels.instance }} 无法ping通"
+
+  - alert: HighNetworkLatency
+    expr: probe_duration_seconds{job="network-ping"} > 1
+    for: 5m
+    labels:
+      severity: warning
+    annotations:
+      summary: "网络延迟过高"
+      description: "设备 {{ $labels.instance }} 延迟达到 {{ $value }}秒"