feat(ai): Phase 22 OpenClaw + Nemotron 協作架構 (ADR-044)

統帥批准實作「仲裁-執行分工」架構:
- OpenClaw = 仲裁者 (Why + Risk Level)
- Nemotron = 執行者 (How + kubectl Command)

新增功能:
- config.py: ENABLE_NEMOTRON_COLLABORATION Feature Flag
- openclaw.py: generate_incident_proposal_with_tools()
- openclaw.py: _call_nemotron_tools() Nemotron 呼叫
- telegram_gateway.py: TelegramMessage Nemotron 欄位
- telegram_gateway.py: format_with_nemotron() 雙區塊格式
- decision_manager.py: 整合協作方法
- proposal_service.py: 整合協作方法

觸發條件:
- LOW 風險 → 僅 OpenClaw
- MEDIUM/HIGH/CRITICAL → OpenClaw + Nemotron 雙軌

首席架構師審查: 83/100 條件通過

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

apps/api/src/services/decision_manager.py

@@ -552,11 +552,12 @@ class DecisionManager:
         # Expert System 同步執行 (立即可用)
         expert_result = expert_analyze(incident)
 
-        # LLM 非同步執行
+        # LLM 非同步執行 (Phase 22: OpenClaw + Nemotron 協作)
+        # 2026-03-31 Claude Code: 使用 _with_tools 方法啟用雙軌協作
         try:
             signals_dict = [s.model_dump() for s in incident.signals]
 
-            llm_result, provider, success = await self._openclaw.generate_incident_proposal(
+            llm_result, provider, success = await self._openclaw.generate_incident_proposal_with_tools(
                 incident_id=incident.incident_id,
                 severity=incident.severity.value,
                 signals=signals_dict,