Dashboard setup wizard uses invalid model ID for OpenRouter

[ntamero]

Bug Description

When selecting OpenRouter as the LLM provider during the dashboard setup wizard, the agent is created with model ID claude-sonnet-4-20250514 which is not a valid OpenRouter model ID.

OpenRouter requires the format provider/model-name (e.g., anthropic/claude-sonnet-4-20250514 or deepseek/deepseek-chat-v3-0324).

Steps to Reproduce

1. Fresh install OpenFang v0.3.2
2. Set OPENROUTER_API_KEY in .env
3. Set default_model.provider = "openrouter" in config.toml
4. Open dashboard and go through setup
5. Select OpenRouter as provider
6. Send a test message

Expected Behavior

The dashboard should use the correct OpenRouter model ID format (e.g., anthropic/claude-sonnet-4-20250514 or offer a valid model dropdown).

Actual Behavior

API error (400): {"error":{"message":"claude-sonnet-4-20250514 is not a valid model ID","code":400}}

Agent enters panic state and becomes unresponsive.

Environment

• OpenFang v0.3.2
• Ubuntu 24.04 (Hetzner VPS)
• OpenRouter provider with valid API key (test-key passes OK)

Logs

WARN openfang_runtime::agent_loop: LLM error classified: LLM request failed.
  category=Format retryable=false
  raw=API error (400): {"error":{"message":"claude-sonnet-4-20250514 is not a valid model ID","code":400}}
WARN openfang_kernel::supervisor: Agent panic recorded total_panics=2