feat(api+telegram): Sprint 4 Phase C+D — API 端點 + Telegram 處置統計

Phase C: API 端點
- C1: GET /api/v1/stats/disposition — 完整處置分佈統計
  - DispositionSummary: auto/human/manual/cold_start + auto_rate
  - DispositionByAnomaly: 按異常類型明細 (最多 20 筆)
  - Redis SCAN + HGETALL 聚合
- C2: GET /api/v1/auto-repair/stats 擴充 disposition_summary

Phase D: Telegram 告警格式
- D1: 告警卡片加處置統計行
  - 🤖 自動: N | 👤 審核: N | 🔧 手動: N
  - 自動化率百分比
- D2: 歷史按鈕強化處置分佈明細
  - 完整 5 項計數 + 自動化率

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

apps/api/src/services/telegram_gateway.py

@@ -240,12 +240,32 @@ class TelegramMessage:
                 "PERMANENT_FIX": "🚨",
             }.get(freq.get("escalation_level"), "")
 
+            # 2026-04-07 Claude Code: Sprint 4 D1 — 處置統計行
+            auto_r = freq.get("auto_repair_count", 0)
+            human_a = freq.get("human_approved_count", 0)
+            manual_r = freq.get("manual_resolved_count", 0)
+            cold_s = freq.get("cold_start_trust_count", 0)
+            total_res = freq.get("total_resolution_count", 0)
+
+            # 處置分佈行 (只在有處置紀錄時顯示)
+            disposition_line = ""
+            if total_res > 0:
+                auto_total = auto_r + cold_s
+                auto_rate = int(auto_total / total_res * 100) if total_res > 0 else 0
+                disposition_line = (
+                    f"├ 🤖 自動: <code>{auto_total}</code>"
+                    f" | 👤 審核: <code>{human_a}</code>"
+                    f" | 🔧 手動: <code>{manual_r}</code>\n"
+                    f"├ 自動化率: <b>{auto_rate}%</b>\n"
+                )
+
             frequency_block = (
                 f"━━━━━━━━━━━━━━━━━━━\n"
                 f"📊 <b>頻率統計</b> {escalation_emoji}\n"
-                f"├ 1h: <code>{freq.get('count_1h', 0)}</code> 次\n"
-                f"├ 24h: <code>{freq.get('count_24h', 0)}</code> 次\n"
-                f"└ 修復: <code>{freq.get('auto_repair_count', 0)}</code> 次\n"
+                f"├ 1h: <code>{freq.get('count_1h', 0)}</code> 次"
+                f" | 24h: <code>{freq.get('count_24h', 0)}</code> 次\n"
+                f"{disposition_line}"
+                f"└ 累計修復: <code>{auto_r}</code> 次\n"
             )
             if freq.get("escalation_level"):
                 frequency_block += f"🔺 升級: <b>{freq['escalation_level']}</b>\n"
@@ -2550,6 +2570,21 @@ class TelegramGateway:
                 if fs.last_repair_action:
                     lines.append(f"  最後動作: {html.escape(fs.last_repair_action[:80])}")
 
+            # 2026-04-07 Claude Code: Sprint 4 D2 — 處置分佈明細
+            total_res = fs.total_resolution_count
+            if total_res > 0:
+                auto_total = fs.auto_repair_count + fs.cold_start_trust_count
+                auto_rate = int(auto_total / total_res * 100) if total_res > 0 else 0
+                lines += [
+                    f"",
+                    f"📋 <b>處置分佈</b> (共 {total_res} 次)",
+                    f"  🤖 自動修復: {fs.auto_repair_count}",
+                    f"  ❄️ 冷啟動信任: {fs.cold_start_trust_count}",
+                    f"  👤 人工審核: {fs.human_approved_count}",
+                    f"  🔧 手動處理: {fs.manual_resolved_count}",
+                    f"  📈 自動化率: <b>{auto_rate}%</b>",
+                ]
+
             await self.send_notification("\n".join(lines))
 
         except Exception as e: