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

app/api/lifespan.py

@@ -11,6 +11,7 @@ from app.core.plugin_system.registry import registry
 from app.repositories.proxy_repo import ProxyRepository
 from app.repositories.settings_repo import SettingsRepository, DEFAULT_SETTINGS
 from app.services.validator_service import ValidatorService
+from app.services.proxy_scoring import compute_proxy_quality_score
 from app.services.plugin_runner import PluginRunner
 from app.services.scheduler_service import SchedulerService
 from app.api.ws_manager import ConnectionManager
@@ -63,12 +64,21 @@ async def lifespan(app: FastAPI):
                         return
                     if existing.validated == 0:
                         if is_valid:
+                            lat_ms = (
+                                float(latency)
+                                if latency is not None and float(latency) > 0
+                                else None
+                            )
+                            uc = int(getattr(existing, "use_count", 0) or 0)
+                            q_score = compute_proxy_quality_score(
+                                lat_ms, uc, app_settings
+                            )
                             await proxy_repo.insert_or_update(
                                 db,
                                 proxy.ip,
                                 proxy.port,
                                 proxy.protocol,
-                                score=app_settings.score_valid,
+                                score=q_score,
                             )
                             if latency:
                                 await proxy_repo.update_response_time(
@@ -78,12 +88,21 @@ async def lifespan(app: FastAPI):
                             await proxy_repo.delete(db, proxy.ip, proxy.port)
                     else:
                         if is_valid:
+                            lat_ms = (
+                                float(latency)
+                                if latency is not None and float(latency) > 0
+                                else None
+                            )
+                            uc = int(getattr(existing, "use_count", 0) or 0)
+                            q_score = compute_proxy_quality_score(
+                                lat_ms, uc, app_settings
+                            )
                             await proxy_repo.insert_or_update(
                                 db,
                                 proxy.ip,
                                 proxy.port,
                                 proxy.protocol,
-                                score=app_settings.score_valid,
+                                score=q_score,
                             )
                             if latency:
                                 await proxy_repo.update_response_time(