feat: JSON 配置、质量分与仪表盘，及设置与爬取流程

- 后端改为 config/app.json；pytest 使用 config/app.test.json 与 set_config_file，不再依赖环境变量；移除 pydantic-settings。

- 前端 API/WebSocket 由 config/webui.json 经 Vite define 注入。

- 代理分数按延迟与随机取用次数计算，新增 use_count 与 proxy_scoring；保存设置时同步调度器启停。

- 仪表盘双饼图（可用/待验证协议）；设置页去掉调度器启停按钮并移动立即验证；爬取全部结束后自动提交全量验证。

- 删除 script/settings_maintain.py（此前已标记删除）。

Made-with: Cursor

config/app.json

@@ -0,0 +1,37 @@
+{
+  "db_path": "db/proxies.sqlite",
+  "host": "127.0.0.1",
+  "port": 18080,
+  "validator_timeout": 5,
+  "validator_max_concurrency": 200,
+  "validator_connect_timeout": 3,
+  "crawler_num_validators": 50,
+  "crawler_max_queue_size": 500,
+  "log_level": "INFO",
+  "log_dir": "logs",
+  "ws_stats_interval_seconds": 1,
+  "export_max_records": 10000,
+  "score_valid": 10,
+  "score_invalid": -5,
+  "score_min": 0,
+  "score_max": 100,
+  "score_latency_ref_ms": 500.0,
+  "score_use_penalty_per_pick": 2.5,
+  "score_max_use_penalty": 70.0,
+  "score_default_latency_ms": 1500.0,
+  "validator_test_urls": [
+    "http://httpbin.org/ip",
+    "https://httpbin.org/ip",
+    "http://api.ipify.org",
+    "https://api.ipify.org",
+    "http://www.baidu.com",
+    "http://www.qq.com"
+  ],
+  "plugins_dir": "plugins",
+  "cors_origins": [
+    "http://localhost:8080",
+    "http://localhost:5173",
+    "http://127.0.0.1:18081",
+    "http://localhost:18081"
+  ]
+}

config/app.test.json

@@ -0,0 +1,33 @@
+{
+  "db_path": "db/proxies.test.sqlite",
+  "host": "127.0.0.1",
+  "port": 18080,
+  "validator_timeout": 5,
+  "validator_max_concurrency": 200,
+  "validator_connect_timeout": 3,
+  "crawler_num_validators": 50,
+  "crawler_max_queue_size": 500,
+  "log_level": "INFO",
+  "log_dir": "logs",
+  "ws_stats_interval_seconds": 1,
+  "export_max_records": 10000,
+  "score_valid": 10,
+  "score_invalid": -5,
+  "score_min": 0,
+  "score_max": 100,
+  "score_latency_ref_ms": 500.0,
+  "score_use_penalty_per_pick": 2.5,
+  "score_max_use_penalty": 70.0,
+  "score_default_latency_ms": 1500.0,
+  "validator_test_urls": [
+    "http://httpbin.org/ip",
+    "https://httpbin.org/ip"
+  ],
+  "plugins_dir": "plugins",
+  "cors_origins": [
+    "http://localhost:8080",
+    "http://127.0.0.1:18081",
+    "http://localhost:18081"
+  ],
+  "run_network_tests": false
+}

config/webui.json

@@ -0,0 +1,4 @@
+{
+  "api_base_url": "http://127.0.0.1:18080",
+  "ws_url": ""
+}