feat(plugin): show routing summary in /manifest command

[guillaumegay13]

I would like to enrich the result of /manifest command to show more info such as :

• active routing providers
• current models used : Simple -> ... (auto) or Reasoning -> ... (override)

The plugin now reads a new OTLP-authenticated routing summary endpoint.

It's a first step towards a more broadly used manifest command that'll allow to change configurations such as switching between models.

This PR introduces only read-only changes tho.

---

Summary by cubic

Adds a routing summary to /manifest showing active providers and each tier’s effective model (auto vs override). Implements a new authenticated GET /api/v1/routing/summary and updates the plugin to display it with safe fallbacks.

• New Features

  • Backend: GET /api/v1/routing/summary returns agentName, active providers (auth type), and tiers (simple, standard, complex, reasoning) with effective model, source, and fallback_models. Only active providers are returned, sorted by provider then auth type, and missing auth_type defaults to api_key. Missing tiers default to auto with null model, and fallback_models default to [].
  • Plugin: /manifest fetches the summary (5s timeout, Bearer from apiKey if set), prints “Providers” and “Routing”, formats auth types (“api key”/“subscription”), shows “unassigned” for null models, strips /otlp from endpoint to derive base URL, and logs/falls back silently if the summary is unavailable.

• Tests

  • Backend: cover summary logic for missing tiers, provider sorting, and defaulting auth_type.
  • Plugin: cover successful summary output, empty providers and unknown tiers, Authorization header usage, failed requests, and non-Error failures; verify no summary fetch when connection verify fails.

^{Written for commit 508f455. Summary will update on new commits.}

Related to #1081

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.02%. Comparing base (d14025f) to head (508f455).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1080      +/-   ##
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+ Coverage   99.01%   99.02%   +0.01%     
==========================================
  Files         223      223              
  Lines       11580    11626      +46     
  Branches     3650     3664      +14     
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+ Hits        11466    11513      +47     
  Misses         22       22              
+ Partials       92       91       -1     

Flag	Coverage Δ
backend	98.53% <100.00%> (+<0.01%)	⬆️
frontend	99.84% <ø> (ø)
plugin	96.04% <100.00%> (+0.31%)	⬆️

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[cubic-dev-ai]

No issues found across 5 files