openai-like provider does not respect NPCSH_API_URL environment variable

[celeria-ai]

Issue Summary

When using the openai-like provider, the NPCSH_API_URL environment variable is not respected for setting the API base URL. Users are forced to specify api_url in each NPC configuration instead of being able to set it globally via environment variable.

Problem Location

File: npcsh/_state.py
Function: setup_shell()
Lines: ~4145-4155

Current Behavior

During team initialization in setup_shell(), NPCs are assigned default model and provider values from the environment:

for npc_name, npc_obj in team.npcs.items():
    if not npc_obj.model:
        npc_obj.model = initial_state.chat_model
    if not npc_obj.provider:
        npc_obj.provider = initial_state.chat_provider

However, there's no corresponding check to inject NPCSH_API_URL for NPCs using the openai-like provider that don't have an explicit api_url set.

Expected Behavior

Similar to how default model and provider are injected during initialization, NPCs using openai-like provider without an explicit api_url should receive the value from NPCSH_API_URL environment variable.

Use Case

Users trying to use Ollama Cloud services (or other OpenAI-compatible APIs) with the openai-like provider cannot set the API URL globally via NPCSH_API_URL. They are forced to specify api_url in each NPC configuration, which is inconvenient and inconsistent with how other configuration values are handled.

Proposed Fix

In npcsh/_state.py, during the setup_shell() function where default model and provider are set, add logic to inject NPCSH_API_URL for openai-like provider NPCs:

for npc_name, npc_obj in team.npcs.items():
    if not npc_obj.model:
        npc_obj.model = initial_state.chat_model
    if not npc_obj.provider:
        npc_obj.provider = initial_state.chat_provider
    # Inject NPCSH_API_URL for openai-like provider if not explicitly set
    if not getattr(npc_obj, 'api_url', None) and npc_obj.provider == 'openai-like':
        npc_obj.api_url = os.environ.get("NPCSH_API_URL")

Apply the same logic to forenpc if present.

Why npcsh Layer

The fix belongs in npcsh during team initialization, where npcsh-specific environment variables should be injected into NPC configurations. This keeps the core npcpy library agnostic while allowing npcsh to provide configuration defaults at the appropriate layer.

Testing

Test scenarios:

1. Set NPCSH_API_URL=https://ollama-cloud.example.com/v1 and use provider: openai-like without explicit api_url - should use the env var
2. Explicit api_url parameter in NPC config should still take precedence over environment variable
3. Verify existing behavior for other providers is not affected