Fix Windows startup with untrusted external auth

[1jehuang]

Summary

• Skip untrusted external auth sources during noninteractive auto-provider bootstrap instead of aborting server startup
• Preserve fatal consent behavior for explicit provider choices
• Add a regression test for noninteractive auto mode with untrusted OpenCode Claude auth
• Include the regression in Windows smoke targeted validation

Validation

• Local: Diff in /home/jeremy/jcode/src/provider/openrouter.rs:576:
  })
  .collect::<HashMap<_, _>>();
  if let Some(inferred_profile) = inferred_profile {
  �[31m- for (model, limit) in openai_compatible_profile_static_context_limits(inferred_profile) {
  �(B�[m�[32m+ for (model, limit) in openai_compatible_profile_static_context_limits(inferred_profile)
  �(B�[m�[32m+ {
  �(B�[m static_context_limits
  .entry(model.to_ascii_lowercase())
  .or_insert(limit);
  Diff in /home/jeremy/jcode/src/provider/openrouter_tests.rs:371:
  };
  config.model_catalog = false;

�[31m- let provider =
�(B�[m�[31m- OpenRouterProvider::new_named_openai_compatible("custom-deepseek", &config)
�(B�[m�[31m- .expect("provider");
�(B�[m�[32m+ let provider = OpenRouterProvider::new_named_openai_compatible("custom-deepseek", &config)
�(B�[m�[32m+ .expect("provider");
�(B�[m
assert_eq!(provider.context_window(), 1_000_000);
assert!(

• GitHub Actions Windows x64: https://github.com/1jehuang/jcode/actions/runs/25340481296

Fixes #112

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