feat(ai): add guarded Claude fallback route

capabilities.json

@@ -134,8 +134,8 @@
 
   "ai_providers": {
     "schema_version": "ai_provider_production_route_v1",
-    "fallback_order": ["ollama_gcp_a", "ollama_gcp_b", "ollama_local", "gemini"],
-    "route_label": "GCP-A -> GCP-B -> host111 Ollama -> Gemini API",
+    "fallback_order": ["ollama_gcp_a", "ollama_gcp_b", "ollama_local", "claude", "gemini"],
+    "route_label": "GCP-A -> GCP-B -> host111 Ollama -> Anthropic Claude API -> Gemini API",
     "router_toggle": "USE_AI_ROUTER",
     "providers": [
       {
@@ -165,6 +165,18 @@
         "production_executable": true,
         "description": "全域 production 第三跳"
       },
+      {
+        "name": "claude",
+        "identity": "Anthropic Claude API",
+        "model": "claude-sonnet-5",
+        "input_cost_per_1m_tokens_usd": 3.0,
+        "output_cost_per_1m_tokens_usd": 15.0,
+        "timeout_seconds": 30,
+        "production_executable": true,
+        "default_execution_mode": "shadow",
+        "execution_gate": "configured_and_enabled_and_mode_selected_and_atomic_cost_guard_reserved",
+        "description": "Claude Sonnet 5 — 第四跳 SRE/架構付費備援，預設 shadow/no-call"
+      },
       {
         "name": "gemini",
         "identity": "Gemini API",
@@ -177,7 +189,6 @@
       }
     ],
     "shadow_metadata_only": [
-      {"name": "claude", "production_executable": false},
       {"name": "nvidia", "production_executable": false},
       {"name": "nemotron", "production_executable": false},
       {"name": "openclaw_nemo", "production_executable": false},