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

edge-agent/docker-compose.yml

@@ -13,7 +13,7 @@ services:
       - CENTRAL_SERVER_PORT=${CENTRAL_SERVER_PORT:-8428}
     volumes:
       - vmagent-cache-data:/cache
-      - ./prometheus-edge/vmagent-scrape.yml.template:/etc/vmagent/scrape.yml:ro
+      - ./config/vmagent/vmagent-scrape.yml.template:/etc/vmagent/scrape.yml:ro
       - ./config/target-onvif.json:/etc/prometheus/target-onvif.json:ro
       - ./config/target-ping.json:/etc/prometheus/target-ping.json:ro
     mem_limit: "256m"
@@ -38,8 +38,8 @@ services:
       - onvif
     image: onvif-exporter:local
     build:
-      context: ./onvif-exporter
-      dockerfile: Dockerfile
+      context: .
+      dockerfile: apps/onvif-exporter/Dockerfile
     container_name: onvif-exporter
     restart: unless-stopped
     environment:
@@ -57,7 +57,7 @@ services:
     container_name: blackbox-exporter
     restart: unless-stopped
     volumes:
-      - ./blackbox/config.yml:/etc/blackbox_exporter/config.yml:ro
+      - ./config/blackbox/config.yml:/etc/blackbox_exporter/config.yml:ro
     mem_limit: "64m"
     cpus: "0.5"
     networks: