refactor: clean up project structure

- Remove old review reports (keep latest only)
- Move docs/ to deploy/docs-backup/
- Move performance-testing/ to deploy/
- Clean up test output files
- Organize root directory

deploy/monitoring/prometheus/prometheus-multi-node.yml

@@ -0,0 +1,55 @@
+# Sub2API 多机节点 Prometheus 配置
+# 本地保留3天，同时 remote_write 到中心存储
+
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+  external_labels:
+    cluster: '${CLUSTER_NAME:-sub2api}'
+    replica: '${INSTANCE_NAME:-node-1}'
+    region: '${REGION:-default}'
+
+# 本地只保留3天数据
+storage:
+  tsdb:
+    retention.time: 3d
+    retention.size: 500MB
+    wal-compression: true
+
+# 发送到中心存储
+remote_write:
+  - url: '${VM_INSERT_URL:-http://localhost:8480}/insert/0/prometheus/api/v1/write'
+    queue_config:
+      capacity: 10000
+      max_samples_per_send: 2000
+      batch_send_deadline: 5s
+      min_shards: 1
+      max_shards: 2
+      min_backoff: 30ms
+      max_backoff: 5s
+    metadata_config:
+      send: true
+      max_samples_per_send: 2000
+
+rule_files:
+  - 'rules/sub2api-alerts-light.yml'
+
+scrape_configs:
+  - job_name: 'sub2api-app'
+    static_configs:
+      - targets: ['localhost:8080']
+        labels:
+          service: 'sub2api'
+          tier: 'backend'
+    metrics_path: '/metrics'
+    scrape_interval: 15s
+
+  - job_name: 'node-exporter'
+    static_configs:
+      - targets: ['localhost:9100']
+    scrape_interval: 15s
+
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:9090']
+    scrape_interval: 15s