Replace hardcoded OPENROUTER_API_KEY hint with provider-aware logic:
- keyless local providers (ollama, llamacpp, etc.) show chat/gateway/status hints
- device-flow providers (copilot, gemini, openai-codex) show OAuth/first-run hint
- all other providers show the correct provider-specific env var via provider_env_var()
Also adds canonical alias "github-copilot" -> "copilot" in canonical_provider_name(),
and a new provider_supports_device_flow() helper with accompanying test.
Additionally fixes pre-existing compile blockers that prevented CI from running:
- fix(security): correct raw string literals in leak_detector.rs that terminated
early due to unescaped " inside r"..." (use r#"..."# instead)
- fix(gateway): add missing wati: None in two test AppState initializations
- fix(gateway): use serde::Deserialize path on WatiVerifyQuery struct
- fix(security): add #[allow(unused_imports)] on new pub use re-exports in mod.rs
- fix(security): remove unused serde::{Deserialize, Serialize} import
- chore: apply cargo fmt to files that had pending formatting diffs
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
