fix: clarify affinity disabled channel retry message

[seefs001]

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修改渠道亲和性命中的渠道被禁用的提示文案
“渠道亲和性命中的渠道已被禁用，已按规则停止重试，请联系管理员处理“

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• 🐛 Bug 修复 (Bug fix) - 请关联对应 Issue，避免将设计取舍、理解偏差或预期不一致直接归类为 bug
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Summary by CodeRabbit

• Bug Fixes
  • Improved error messaging when a preferred channel becomes disabled, with translations in English, Simplified Chinese, and Traditional Chinese.

[coderabbitai]

Walkthrough

This PR adds a new i18n message key MsgDistributorAffinityChannelDisabled to provide a specific error message when a channel selected via affinity is disabled. The constant is added to the keys file, translated into three languages, and the distributor middleware is updated to use this more specific message.

Changes

Cohort / File(s)	Summary
I18n Constants i18n/keys.go	Added new exported constant MsgDistributorAffinityChannelDisabled with value "distributor.affinity_channel_disabled".
I18n Locale Translations i18n/locales/en.yaml, i18n/locales/zh-CN.yaml, i18n/locales/zh-TW.yaml	Added translations for distributor.affinity_channel_disabled key in English, Simplified Chinese, and Traditional Chinese locales, providing user-facing error messages for the affinity channel disabled scenario.
Distributor Middleware middleware/distributor.go	Updated forbidden error response to use the new specific i18n key MsgDistributorAffinityChannelDisabled instead of the generic MsgDistributorChannelDisabled.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A message most specific, for channels affinity-bound,
When disabled they become, no retry is found—
Three tongues now speak the truth,
With grace and careful proof! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 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 (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: updating the error message for when a channel selected by affinity is disabled to be more specific and user-friendly.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

🧹 Nitpick comments (1)

i18n/locales/en.yaml (1)

260-260: Optional: minor phrasing polish.

"retry was stopped by rule" reads awkwardly in English. Consider a more idiomatic phrasing such as "retries have been halted per policy" to better match the Chinese source ("已按规则停止重试").

✏️ Proposed wording

-distributor.affinity_channel_disabled: "The channel selected by channel affinity has been disabled, and retry was stopped by rule. Please contact the administrator"
+distributor.affinity_channel_disabled: "The channel selected by channel affinity has been disabled; retries have been halted per policy. Please contact the administrator."

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@i18n/locales/en.yaml` at line 260, Update the translation value for the key
distributor.affinity_channel_disabled to use more idiomatic English; replace
"retry was stopped by rule" with phrasing like "retries have been halted per
policy" so the full message reads: "The channel selected by channel affinity has
been disabled, and retries have been halted per policy. Please contact the
administrator" — locate the key distributor.affinity_channel_disabled in en.yaml
and update its string accordingly.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@i18n/locales/en.yaml`:
- Line 260: Update the translation value for the key
distributor.affinity_channel_disabled to use more idiomatic English; replace
"retry was stopped by rule" with phrasing like "retries have been halted per
policy" so the full message reads: "The channel selected by channel affinity has
been disabled, and retries have been halted per policy. Please contact the
administrator" — locate the key distributor.affinity_channel_disabled in en.yaml
and update its string accordingly.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4e18f30b-c343-4195-bcc5-7dbf3110d0f4

📥 Commits

Reviewing files that changed from the base of the PR and between f2f3410 and 3553072.

📒 Files selected for processing (5)

• i18n/keys.go
• i18n/locales/en.yaml
• i18n/locales/zh-CN.yaml
• i18n/locales/zh-TW.yaml
• middleware/distributor.go