feat(运维监控): 增强监控功能和健康评分系统

后端改进：
- 新增健康评分计算服务（ops_health_score.go）
- 添加分布式锁支持（ops_advisory_lock.go）
- 优化指标采集和聚合逻辑
- 新增运维指标采集间隔配置（60-3600秒）
- 移除未使用的WebSocket查询token认证中间件
- 改进清理服务和告警评估逻辑

前端改进：
- 简化OpsDashboard组件结构
- 完善国际化文本（中英文）
- 新增运维监控相关API类型定义
- 添加运维指标采集间隔设置界面
- 优化错误详情模态框

测试：
- 添加健康评分单元测试
- 更新API契约测试

frontend/src/i18n/locales/en.ts

@@ -1733,8 +1733,10 @@ export default {
       redis: 'Redis',
       goroutines: 'Goroutines',
       jobs: 'Jobs',
+      jobsHelp: 'Click “Details” to view job heartbeats and recent errors',
       active: 'active',
       idle: 'idle',
+      waiting: 'waiting',
       ok: 'ok',
       lastRun: 'last_run:',
       lastSuccess: 'last_success:',
@@ -1770,12 +1772,50 @@ export default {
       errorsSla: 'Errors (SLA scope)',
       upstreamExcl429529: 'Upstream (excl 429/529)',
       failedToLoadData: 'Failed to load ops data.',
+      failedToLoadOverview: 'Failed to load overview',
+      failedToLoadThroughputTrend: 'Failed to load throughput trend',
+      failedToLoadLatencyHistogram: 'Failed to load latency histogram',
+      failedToLoadErrorTrend: 'Failed to load error trend',
+      failedToLoadErrorDistribution: 'Failed to load error distribution',
+      failedToLoadErrorDetail: 'Failed to load error detail',
+      retryFailed: 'Retry failed',
       tpsK: 'TPS (K)',
       top: 'Top:',
       throughputTrend: 'Throughput Trend',
       latencyHistogram: 'Latency Histogram',
       errorTrend: 'Error Trend',
       errorDistribution: 'Error Distribution',
+      // Health Score & Diagnosis
+      health: 'Health',
+      healthCondition: 'Health Condition',
+      healthHelp: 'Overall system health score based on SLA, error rate, and resource usage',
+      healthyStatus: 'Healthy',
+      riskyStatus: 'At Risk',
+      idleStatus: 'Idle',
+      diagnosis: {
+        title: 'Smart Diagnosis',
+        footer: 'Automated diagnostic suggestions based on current metrics',
+        idle: 'System is currently idle',
+        idleImpact: 'No active traffic',
+        upstreamCritical: 'Upstream error rate critically high ({rate}%)',
+        upstreamCriticalImpact: 'May affect many user requests',
+        upstreamHigh: 'Upstream error rate elevated ({rate}%)',
+        upstreamHighImpact: 'Recommend checking upstream service status',
+        slaCritical: 'SLA critically below target ({sla}%)',
+        slaCriticalImpact: 'User experience severely degraded',
+        slaLow: 'SLA below target ({sla}%)',
+        slaLowImpact: 'Service quality needs attention',
+        errorHigh: 'Error rate too high ({rate}%)',
+        errorHighImpact: 'Many requests failing',
+        errorElevated: 'Error rate elevated ({rate}%)',
+        errorElevatedImpact: 'Recommend checking error logs',
+        healthCritical: 'Overall health score critically low ({score})',
+        healthCriticalImpact: 'Multiple metrics may be degraded; prioritize error rate and latency investigation',
+        healthLow: 'Overall health score low ({score})',
+        healthLowImpact: 'May indicate minor instability; monitor SLA and error rates',
+        healthy: 'All system metrics normal',
+        healthyImpact: 'Service running stable'
+      },
       // Error Log
       errorLog: {
         timeId: 'Time / ID',
@@ -2069,7 +2109,21 @@ export default {
         throughputTrend: 'Requests/QPS + Tokens/TPS in the selected window.',
         latencyHistogram: 'Latency distribution (duration_ms) for successful requests.',
         errorTrend: 'Error counts over time (SLA scope excludes business limits; upstream excludes 429/529).',
-        errorDistribution: 'Error distribution by status code.'
+        errorDistribution: 'Error distribution by status code.',
+        goroutines:
+          'Number of Go runtime goroutines (lightweight threads). There is no absolute “safe” number—use your historical baseline. Heuristic: <2k is common; 2k–8k watch; >8k plus rising queue/latency often suggests blocking/leaks.',
+        cpu: 'CPU usage percentage, showing system processor load.',
+        memory: 'Memory usage, including used and total available memory.',
+        db: 'Database connection pool status, including active, idle, and waiting connections.',
+        redis: 'Redis connection pool status, showing active and idle connections.',
+        jobs: 'Background job execution status, including last run time, success time, and error information.',
+        qps: 'Queries Per Second (QPS) and Tokens Per Second (TPS), real-time system throughput.',
+        tokens: 'Total number of tokens processed in the current time window.',
+        sla: 'Service Level Agreement success rate, excluding business limits (e.g., insufficient balance, quota exceeded).',
+        errors: 'Error statistics, including total errors, error rate, and upstream error rate.',
+        latency: 'Request latency statistics, including p50, p90, p95, p99 percentiles.',
+        ttft: 'Time To First Token, measuring the speed of first byte return in streaming responses.',
+        health: 'System health score (0-100), considering SLA, error rate, and resource usage.'
       },
       charts: {
         emptyRequest: 'No requests in this window.',
@@ -2183,7 +2237,9 @@ export default {
         queryModeHint: 'Default query mode for Ops Dashboard (auto/raw/preagg)',
         queryModeAuto: 'Auto (recommended)',
         queryModeRaw: 'Raw (most accurate, slower)',
-        queryModePreagg: 'Preagg (fastest, requires aggregation)'
+        queryModePreagg: 'Preagg (fastest, requires aggregation)',
+        metricsInterval: 'Metrics Collection Interval (seconds)',
+        metricsIntervalHint: 'How often to collect system/request metrics (60-3600 seconds)'
       },
       adminApiKey: {
         title: 'Admin API Key',