refactor(gateway_logs): replace manual ASCII table with console.RenderTable

[Copilot]

renderGatewayMetricsTable in pkg/cli/gateway_logs.go built tables manually using Unicode box-drawing characters and fixed-width fmt.Fprintf column alignment. Replaces both tables (server metrics and per-server tool details) with console.RenderTable, gaining TTY-aware rendering, adaptive colors, and consistent border styling.

Changes

• Server Usage table: replaces ~15 lines of box-drawing with console.RenderTable(TableConfig{Title: "Server Usage", Headers: [...]})
• Tool Usage tables (verbose): same replacement, one table per server using server name as Title
• Removed stringutil import — fixed-width truncation for manual column alignment no longer needed
• Added strconv import — strconv.Itoa replaces fmt.Sprintf("%d", ...) per linter (perfsprint)

// Before
output.WriteString("┌────────────────────────────┬──────────┬────────────┬───────────┬────────┐\n")
output.WriteString("│ Server                     │ Requests │ Tool Calls │ Avg Time  │ Errors │\n")
// ...
fmt.Fprintf(&output, "│ %-26s │ %8d │ %10d │ %7.0fms │ %6d │\n", ...)

// After
output.WriteString(console.RenderTable(console.TableConfig{
    Title:   "Server Usage",
    Headers: []string{"Server", "Requests", "Tool Calls", "Avg Time", "Errors"},
    Rows:    serverRows,
}))

[Copilot]

Pull request overview

Refactors gateway metrics output to use console.RenderTable instead of manually building fixed-width Unicode tables, improving consistency and TTY-aware styling.

Changes:

• Replaced the “Server Usage” metrics table rendering with console.RenderTable.
• Replaced per-server “Tool Usage” verbose tables with console.RenderTable.
• Updated imports (removed stringutil, added strconv) to support the new formatting approach.

Comments suppressed due to low confidence (1)

pkg/cli/gateway_logs.go:568

• Previously tool names were truncated (24 chars) to keep the per-server tool table width bounded. Passing toolName through unmodified can produce very wide tables for long tool identifiers. Consider truncating tool names before adding them to toolRows (or supporting max column widths in console.RenderTable).

				toolRows = append(toolRows, []string{
					toolName,
					strconv.Itoa(tool.CallCount),
					fmt.Sprintf("%.0fms", tool.AvgDuration),
					fmt.Sprintf("%.0fms", tool.MaxDuration),
					strconv.Itoa(tool.ErrorCount),

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