feat: support regex-prefixed ignored upstream models

[seefs001]

#3380

Summary by CodeRabbit

• New Features

  • Model filtering now supports regex patterns (prefixed with regex:) alongside exact model name matching.

• Documentation

  • Updated UI hints, placeholder examples, and localization strings to clarify exact and regex pattern syntax support.

• Tests

  • Added test coverage for regex pattern matching in model filtering scenarios.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 45ee9157-8cb0-4793-9746-260bd4317cb6

📥 Commits

Reviewing files that changed from the base of the PR and between deff59a and 45f65c2.

📒 Files selected for processing (4)

• controller/channel_upstream_update.go
• controller/channel_upstream_update_test.go
• web/src/components/table/channels/modals/EditChannelModal.jsx
• web/src/i18n/locales/en.json

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Walkthrough

The PR enhances the upstream model ignore mechanism to support regex patterns (prefixed with regex:) alongside exact-name matching. The backend computes normalized ignored models once and applies either exact or regex matching when filtering pending additions. Supporting UI placeholders and translation strings are updated to reflect the expanded capability.

Changes

Cohort / File(s)	Summary
Backend ignore matching logic controller/channel_upstream_update.go	Replaces ignoredSet map with normalized ignore list supporting both exact matching and regex patterns (prefixed with regex:). Regex matching uses regexp.MatchString with whitespace-trimmed patterns; invalid regex patterns are treated as non-matching rather than ignored.
Test coverage controller/channel_upstream_update_test.go	Adds new test TestCollectPendingUpstreamModelChangesFromModels_WithIgnoredRegexPatterns validating that both exact matches (gpt-4.1) and regex patterns (regex:^sora-.*$) correctly filter upstream models.
UI and i18n web/src/components/table/channels/modals/EditChannelModal.jsx, web/src/i18n/locales/en.json	Updates placeholder text in upstream_model_update_ignored_models field to show regex pattern examples and adds clarifying help text explaining exact matching and regex: prefix support.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Fix/auto fetch upstream model tips #3096: Both PRs modify the upstream model update flow in controller/channel_upstream_update.go and alter ignore handling logic for upstream models.

Poem

🐰 A rabbit hops through patterns new,
With regex magic, not just a few,
Exact matches dance with regex: cheer,
Model ignores now crystal clear! 🎭

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main feature: adding regex prefix support for ignored upstream models, which is reflected in the production code changes and test additions.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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