Each backend is now configured via ~/.config/ollie/backends.conf:
[openrouter]
key = sk-or-v1-...
model = qwen/qwen3-235b-a22b
[anthropic]
key = sk-ant-...
Each backend knows its own default URL (openrouter → openrouter.ai/api,
anthropic → api.anthropic.com, etc). Only key and optional model needed.
Env vars (OLLIE_OPENAI_KEY, OLLIE_ANTHROPIC_KEY, etc) still work as
fallback for backward compatibility, but backends.conf is the canonical
config path going forward.
- Delete openAIName() (URL no longer determines backend identity)
- Delete geminiKey() (config handles fallback)
- Install template with mode 600 (contains API keys)
- Only install template if user hasn't created their own
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