feat: complete Rust-to-Go rewrite with Bubbletea v2

Rewrites oxker from Rust/ratatui to Go/Bubbletea, migrated to the
Bubbletea v2 API (charm.land/bubbletea/v2). Removes all original Rust
source files and legacy Go modules (internal/ui, internal/input, bubbles).

Key changes:
- View() returns tea.View with declarative AltScreen and MouseMode
- KeyMsg → KeyPressMsg, MouseMsg → MouseClickMsg/WheelMsg/MotionMsg/ReleaseMsg
- execWriteKey rewritten for v2 key fields (Code/Mod/Text)
- Mouse toggle via View field instead of imperative commands
- Filter/search text input uses msg.Text for v2 space key compat

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/utils/ratelimiter.go

@@ -0,0 +1,29 @@
+package utils
+
+import (
+	"time"
+)
+
+type RateLimiter struct {
+	lastTime    time.Time
+	minInterval time.Duration
+}
+
+func NewRateLimiter(interval time.Duration) *RateLimiter {
+	return &RateLimiter{
+		minInterval: interval,
+	}
+}
+
+func (r *RateLimiter) Allow() bool {
+	now := time.Now()
+	if now.Sub(r.lastTime) >= r.minInterval {
+		r.lastTime = now
+		return true
+	}
+	return false
+}
+
+func (r *RateLimiter) Reset() {
+	r.lastTime = time.Time{}
+}

internal/utils/scroll.go

@@ -0,0 +1,31 @@
+package utils
+
+type ScrollDirection int
+
+const (
+	ScrollUp ScrollDirection = iota
+	ScrollDown
+	ScrollPageUp
+	ScrollPageDown
+	ScrollHome
+	ScrollEnd
+)
+
+func (sd ScrollDirection) String() string {
+	switch sd {
+	case ScrollUp:
+		return "up"
+	case ScrollDown:
+		return "down"
+	case ScrollPageUp:
+		return "pageup"
+	case ScrollPageDown:
+		return "pagedown"
+	case ScrollHome:
+		return "home"
+	case ScrollEnd:
+		return "end"
+	default:
+		return "unknown"
+	}
+}

internal/utils/stats.go

@@ -0,0 +1,24 @@
+package utils
+
+type ContainerStats struct {
+	ID          string
+	CPU         float64
+	Memory      uint64
+	MemoryLimit uint64
+	RX          uint64
+	TX          uint64
+}
+
+func ContainerStatsFromDocker(stats interface{}, id string) *ContainerStats {
+	var cpu float64
+	var mem, memLimit, rx, tx uint64
+
+	return &ContainerStats{
+		ID:          id,
+		CPU:         cpu,
+		Memory:      mem,
+		MemoryLimit: memLimit,
+		RX:          rx,
+		TX:          tx,
+	}
+}

internal/utils/table.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"strings"
+
+	"github.com/olekukonko/tablewriter"
+)
+
+func FormatTable(data [][]string) string {
+	var sb strings.Builder
+	table := tablewriter.NewWriter(&sb)
+	table.SetHeader([]string{})
+	table.SetBorder(false)
+	table.SetColMinWidth(0, 10)
+	table.SetColMinWidth(1, 20)
+	table.SetColMinWidth(2, 25)
+	table.SetColMinWidth(3, 15)
+	table.SetColMinWidth(4, 20)
+
+	for _, row := range data {
+		table.Append(row)
+	}
+
+	table.Render()
+	return sb.String()
+}