Implement LLM-WP-0007: Kimi K3 default and EUR spend reporting

Add moonshotai/kimi-k3 as OpenRouter basemodel default after live smoke,
USD→EUR cost conversion, append-only usage ledger, and CLI run/cost/spend
week commands with token and euro reporting.

llm_connect/config.py

@@ -24,7 +24,7 @@ class LLMConfig:
     """
 
     provider: str = "openrouter"
-    model: str = "anthropic/claude-sonnet-4"
+    model: str = "moonshotai/kimi-k3"
     api_key: Optional[str] = None
     api_base: str = "https://openrouter.ai/api/v1"
     claude_cli_path: str = "claude"
@@ -101,7 +101,7 @@ def load_config(
 
     defaults: Dict[str, Any] = {
         "provider": provider,
-        "model": model or "anthropic/claude-sonnet-4",
+        "model": model or "moonshotai/kimi-k3",
         "api_key": resolved_key,
     }
     defaults.update(overrides)