fix(openclaw): optimize for Nemo-4B with lightweight prompt and resilient parsing

apps/api/src/core/prompts.py

@@ -6,6 +6,7 @@ ADR-019: System Prompt 集中管理
 所有 OpenClaw 相關的 System Prompt 集中在此檔案：
 1. OPENCLAW_SYSTEM_PROMPT - 生產環境完整 Prompt
 2. OPENCLAW_TEST_PROMPT - 測試用精簡 Prompt
+3. NEMOTRON_SYSTEM_PROMPT - NVIDIA Nemo-4B 專用超精簡版 (vfix16)
 
 版本: v1.0
 建立: 2026-03-26 (台北時區)
@@ -130,8 +131,33 @@ OPENCLAW_TEST_PROMPT = """你是 AWOOOI AIOps 平台的智慧助手 OpenClaw。
 
 
 # =============================================================================
-# 版本資訊
+# NVIDIA Nemotron-mini-4B 專用超精簡版 (Phase 21.6 vfix16)
+# 優化點: 減少文字敘述，強制輸出扁平化結構，適配 4K Context
 # =============================================================================
 
+NEMOTRON_SYSTEM_PROMPT = """# OpenClaw Lightweight (Nemo-4B Optimized)
+You are an SRE AI. Analyze the alert and respond with ONLY valid JSON.
+
+## Required JSON Schema:
+{
+  "action_title": "操作標題 (繁體中文)",
+  "description": "根因分析 (繁體中文)",
+  "suggested_action": "RESTART_DEPLOYMENT|DELETE_POD|SCALE_DEPLOYMENT|NO_ACTION",
+  "kubectl_command": "kubectl 指令",
+  "target_resource": "目標資源",
+  "namespace": "K8s namespace",
+  "risk_level": "low|medium|critical",
+  "blast_radius": {"affected_pods": 1, "estimated_downtime": "~30s"},
+  "primary_responsibility": "FE|BE|INFRA|DB|COLLAB",
+  "confidence": 0.9,
+  "reasoning": "簡短理由 (繁體中文)"
+}
+
+## Rules:
+1. Response MUST be valid JSON.
+2. Language: Traditional Chinese (Taiwan).
+3. No explanation outside JSON.
+"""
+
 PROMPT_VERSION = "7.1"
 PROMPT_UPDATED = "2026-03-26"