Phase 5 Batch 2: 4 RM Tool + rm 客户端 + 日志降级链

- internal/rm/client.go: YARN RM 客户端
  - ListApps / GetApp / KillApp / GetLogs
  - GetLogs 降级链数据驱动 (amContainerLogs → aggregated-logs → logs)
  - 跨主机 redirect 保留 Authorization (URLAllowlist 兜底)
- 4 Tool: list_applications / get_application_status /
  get_application_logs / kill_application
  - mcp.WithEnum(state) 约束 YARN app 状态
  - tool handler 永远 (result, nil), 业务错误用 NewToolResultError
- deps.go: +HTTPClient + MaxResponseBytes
- main.go: 注入 httpclient.Client
- 端到端实测: mock RM 验证 4 Tool + 降级链 + 错误路径

Co-Authored-By: Claude <noreply@anthropic.com>

internal/mcp/tools/deps.go

@@ -0,0 +1,22 @@
+package tools
+
+import (
+	"log/slog"
+	"time"
+
+	"spark-mcp-go/internal/analyzer"
+	"spark-mcp-go/internal/httpclient"
+	"spark-mcp-go/internal/storage"
+)
+
+// Deps bundles the dependencies shared by all MCP Tool handlers.
+type Deps struct {
+	Logger             *slog.Logger
+	ClusterRepo        *storage.ClusterRepo
+	SparkSubmitTimeout time.Duration
+	HTTPClient         *httpclient.Client
+	MaxResponseBytes   int64
+	DataDir            string // upload_file writes to DataDir/uploads
+
+	AnalyzerThresholds analyzer.Thresholds
+}