Refine notification events and Telegram delivery

[120318]

Summary

• Replace legacy alerts with the notification center backed by event acknowledgements and action state.
• Rework event boundaries so operation lifecycle records stay in commands/actions while Telegram only receives business events.
• Add Telegram channel support with localized, user-facing messages and an [Aethera] sender marker.
• Add migrations to remove alerts storage and prune operation-only/subscription-run audit events.
• Tighten subscription resource selection after torrent payload verification so later candidates are still considered.

Validation

• ./scripts/review_with_gates.sh

Notes

• PR descriptions for Aethera are written in English by project workflow.

[chatgpt-codex-connector]

💡 Codex Review

Aethera/frontend/src/components/config/addons/NotificationsAddonCard.vue

Line 28 in 0cd57d1

v-model:visible="dialogVisible"

改用 ConfigDialog 支持的 v-model

ConfigDialog 只声明了 modelValue 并发出 update:modelValue，所以这里的 v-model:visible 传入的是一个被忽略的 visible prop；点击“编辑”或启用后设置 dialogVisible 也不会打开通知配置弹窗，下方的频道弹窗同样如此。请改成默认 v-model，或显式使用 :model-value / @update:model-value。

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[120318]

Addressed the review findings in c205dc3:

• Made event acknowledgement idempotent with SQLite ON CONFLICT DO NOTHING.
• Changed Telegram detail links to use the frontend-recognized season query parameter.
• Added a source visibility grace period for scheduled transfers; tasks with sources still missing after the grace period are enqueued so the transfer failure path records a visible error/event.
• Switched notification configuration dialogs from v-model:visible to the supported default v-model.

Validation: ./scripts/review_with_gates.sh passed.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: c205dc35f6

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[120318]

Addressed the latest review follow-ups in 29e4f89:

• Preserved locale and public_base_url in the system tab response so partial system saves do not reset notification language or public links.
• Switched bulk event acknowledgement to SQLite insert-or-ignore and return the actual inserted acknowledgement count.
• Caught transfer precheck TransferExceptions in the scheduled transfer workflow and marked the task with visible transfer-stage failure details.
• Escaped * for Telegram MarkdownV2 and kept indexer failure reasons visible in rendered notifications.
• Added an indexer.site.unhealthy warning event at the consecutive-failure threshold, including default notification patterns, frontend event metadata, and backend/frontend translations.

Validation: ./scripts/review_with_gates.sh passed.